How Do I Remove Rust Stains From Natural Stone?

LTP Rust Stain Remover.

  • Removes surface rust stains
  • Non acidic formulation
  • Removes stains in just 15 minutes

LTP Rust Stain remover ideal for all types of polished and unpolished natural and artificial stone including marble, split face stone cladding, granite, travertine, sandstone, concrete, terracotta and porcelain tiles.

From this

 

To this

In just 15 minutes.

With cleaning of rust as simple as apply on to surface, leave, then scrub and wash off.

Step 1:
First brush off any loose debris, dust and dirt from the surface of the stone, if necessary first wash with area with LTP Powerstripper leave to dry.

Step 2:
Shake well before use. Apply LTP Rust stain remover direct to the rust stain by paint brush or cloth.

Step 3:
Leave on the surface for 15 minutes to act on the rust.
LTP Rust stain remover will change to a purple colour as it reacts with the rust.

Step 4:
Once the indicated time has elapsed, agitate with a white emulsifying pad and rinse the surface with clean water. If necessary repeat the process.

For more information please visit our website here.

 

 

Please note that this information is offered as general guidance only and without guarantee.  Your specific circumstances may need an alternative approach.  In case of doubt, any process should be tried out in an inconspicuous area before general application.

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Sealing Stone Outside

Limestone, Sandstone, Travertine, Marble, Slate, Granite, concrete:
Regardless of what type of flooring you choose, the likelihood is it will require some form of sealing.

This is because natural stone is porous, and therefore if left unsealed, any moisture will be soaked up by the stone making it very difficult to remove, and potentially leaving the surface permanently stained (sometimes even fallen leaves can cause stains).

The best way to prevent all this is to seal the stone.

When you seal a stone, you are essentially filling any voids or pores of the stone with the sealer. This prevents any further liquid to absorb in to the tile, as demonstrated here with this close up shot of a water droplet on a tile sealed with LTP Mattstone.

When sealing natural stone outside it is important to use a breathable impregnating sealer, this will allow the transition of moisture from underneath.
Examples include LTP Mattstone H20 which will leave the stone looking as it does naturally. And LTP External Stone Sealer which will enhance any natural colour in the stone, both of these are water based breathable sealers and will require 24 hours to cure.

It is important to note that all stones located outdoors are susceptible to a condition known as efflorescence.
This blooming is caused by water moving through the substrate of a material and carrying minerals and salts found in the mortar bed, grout, soil or the stone itself.
We have a blog here all about efflorescence.

Its also very important when laying Natural stone to make sure that its fixed on a full bed of adhesive and not spot fixed.
The end result could look like this if its spot fixed.
Spot fixing issue Sandstone

If this has already happened to your patio, we have a blog here.

When sealing different natural stones, what will vary the most will be how many coats the stone will need before it is fully sealed.
Each stone exhibits different levels of porosity. A tumbled Limestone may have a higher porosity level than a Honed and filled Limestone.

Sealing natural stone with Mattstone H20 

Shake bottle before use.

Test the porosity of your stone with water and a teaspoon, using the LTP porosity test.

Once surfaces are clean and dry, apply the product to the surface evenly using a sealant applicator pad, brush or soft cloth.

When sealing its important not to over apply the sealer and redistribute excess, avoid letting the sealer pool on the surface, as this can cause white marks to appear on the stone when it dries.
On highly absorbent surfaces apply several coats wet-in-wet.
After 15 minutes, remove any excess sealer with an absorbent cloth. Do not allow residues to dry on the surface.
Do not walk on the surface for 3 hours and protect from wet conditions for 3 days.

Sealing Stone With LTP External Stone Sealer.

Shake bottle well before use. Apply evenly to the surface using a foam roller or paint brush. On more absorbent surfaces apply further coats at hourly intervals until the surface is completely saturated. Remove any residual sealer if still visible after one hour

Cleaning Tiles Outside

Before you start sealing your stone it is important to make sure your stone is clean and dry, other wise you will just seal in dirt and grime.

Old layers of sealer, dirt residues and light deposits of organic matter and algae must be removed from the surface and pores of the stone.

This can be done by either using LTP Grimex which is a intensive cleaner or LTP Mouldex Paving Cleaner.

To Clean with LTP Grimex, dilute 1:3 with water, apply to the surface with a sponge or water brush and leave to sit on the surface of the tiles for as long as it takes for the dirt to release. (5-30 minutes depending upon the level of dirt). If areas look as if they are drying out just add a little more solution to keep the area wet.

Agitate the surface with a stiff deck brush after approx 10 minutes (scrubber machines can be used).

Continue to scrub while adding clean water. Remove residues from the surface with water or scrubber machine.

Rinse thoroughly with clean fresh water to remove all remaining residues. Use a power washer if necessary.

Allow the surface at least 24 hours to dry before sealing.

To clean with LTP Mouldex Paving Cleaner, Shake well before use.
Surfaces to be treated should be completely dry before application.
Pour solution undiluted directly onto the pavers and spread out evenly using a sponge or paint brush, Garden sprayers can also be used and leave for a minimum of 1 hour.

Apply a little water and agitate with a stiff Deck brush or emulsifying pad to release the dirt and grime, and then rinse thoroughly using a hose or jet wash.
Some stubborn stains and black spot may require a longer treatment, in which case apply and leave on surfaces overnight. If some black spot remains after treatment, It should fade and disappear after a few days following the treatment. If not: re-apply. Keep pets off at all times during treatment. In case of contact with metals, fabrics and painted surfaces rinse with water immediately. Do not use on warm surfaces. Do not apply if rain is imminent. Avoid contact with ponds & plant life: if contact is made rinse well with plenty of water.

General Maintenance.
Weekly or daily depending on conditions, use a hose and a brush to remove any debris that may be lying on the stone.
Then annually if required use LTP Grimex, this will remove surface dirt and grime, possibly every 6-12 months depending on condition.
Dilute Grimex 1:3 parts water and apply the solution on to the surface and agitate.
Leave for 10 minutes before agitating again and then rinse with water.
Allow 24 hours to dry and then if necessary re-apply a light coat of sealer.

PLEASE NOTE: Always follow the detailed instructions on the product labels. Protect stone surfaces from contact with acidic substances. Do not use abrasive materials on honed or polished stones. Avoid using normal detergents or strong bleach cleaners on sealed surfaces as they will gradually remove the protective seal.

Please note that this information is offered as general guidance only and without guarantee. Your specific circumstances may need an alternative approach. In case of doubt, any process should be tried out in an inconspicuous area before general application.

Problem Solving Black Limestone

We are often contacted in particular about black limestone, the appearance of stains and mineral deposits is not uncommon and occurs with most types of limestone, however the appearance on black limestone or darker stone is more prevalent. This is why it is possible to notice some marks appearing even before sealing. As a naturally occurring chemical reaction it is often difficult to avoid. So this blog is all about some of the different things that can happen, what you can do to prevent it or what you can do to resolve the issues as best you can.

Mineral Stains

Mineral deposit stains on black limstone

Mineral stains are sometimes caused when rain water trickles through sand-cement mortar screeds, toppings and bedding under limestone paving can become moderately alkaline. As this rainwater evaporates, its alkalinity increases until the solution becomes saturated.
This solution then can travel to the surface within the limestone where it starts to deposit solids such as white and grey encrustations of calcium carbonate also known as lime plumes.
To remove the the mineral salts from the surface wash the surface with a mild solution of acid*. This will help disperse the mineral salt deposits from the surface.
LTP Grout Stain Remover is a product suitable for the task, dilute 1 part LTP Grout Stain remover in 4 parts warm water and apply to the surface of the stone. Agitate using an emulsifying pad or similar abrasive pad and then rinse thoroughly with plenty of clean water. Repeat process if necessary.
For more information about LTP Grout Stain Remover please see the Technical Data Sheet.

*N.B Grout stain remover may etch the surface and cause the stone to dry lighter.
If the Limestone is either Honed or Polished do not use LTP Grout Stain Remover and instead use LTP Powerstripper.

Mineral deposits causing a banding effect

Halo Stains & Bands Of Mineral Deposits.

This is caused by trace amounts of sodium and potassium oxides within the Limestone which can also be activated by rain water. Even where rain is slightly acidic, the solutions of these salts in rainwater will gradually become alkaline. Surface wetting and evaporation can produce recurrent patches and bands of dampness known as accumulation zones ( rainwater pooling on the surface where it cannot run off).

Evaporation concentrates the alkaline solutions until they become saturated at the  outer limits or edge of accumulation zones. Further evaporation then causes precipitation, crystallisation and immobilisation of the salt at the surface and in pores immediately below the surface. The resulting bands of distinct pigmentation are halo stains as seen in the image above of Limestone.

Grout & Adhesive Stains.

img_0122

Adhesive Stains On Limestone

Grout and adhesive stains like this appear often, if the stone has been sealed beforehand then the process of removing the residues is easier.
After grouting most of the residues should be taken off with water before it fully dries on the surface. For the removal of most grout residues on Limestone we would recommend using LTP Powerstripper. However on more severe cases as shown in the picture above, using a mild solution of LTP Grout Stain Remover may be more effective.
Grout Stain Remover is an acid based cleaner and will etch any acid sensitive surfaces (Limestone, marble, some sandstones, chrome etc).
We would always recommend to test on a small inconspicuous area first.
LTP Grout Stain Remover Tech Data Sheet.

General Dirt & Grime

If your limestone has been outside for a couple of years, it may have seen better days.
General dirt and grime can be easily removed with LTP Grimex.
Dilute in a bucket of water as per instructions on the back of the bottle, then apply and leave for 10 minutes. Give it a scrub with a deck brush or an emulsifying pad and then rinse with plenty of clean water.
After cleaning allow to dry for 24 hours and then the stone will be ready for resealing.

Protect your Limestone with the correct sealing product.

Sealers used to enhance the appearance and help prevent limestone pavers staining from organic matter outside need to be breathable. LTP Mattstone H20 & LTP Stone Oil are examples of breathable sealers suitable for external use. As well as protecting the stone from staining, breathable sealers will allow the microscopic transition of moisture assisting any trapped moisture to escape through the stone from the mortar and sub surfaces. However, moisture permeating through the stone and sealer to the surface can still dry to leave a calciferous deposit.

Once the stone is thoroughly dry and mineral salt deposits are greatly reduced, general dirt and grime has been cleaned off, reseal the stone with an appropriate limestone sealer. LTP Mattstone H20 is highly effective natural stone sealing solution and is suitable for exterior use. However many of our customers have used LTP Stone Oil after acid washing their stone as it helps to re-enhance and deepen the colour.

Apply LTP Stone Oil to the surface of the stone using a paint brush. Allow it to absorb into the stone and then remove any visible excess from the surface after 45 minutes using an absorbent dry towel. The aim is to completely saturate the stone with as many coats of the sealer as necessary, but do not allow the sealer to dry and leave a film on the surface. Do not apply in direct sunlight.
For more information on how to apply please see the Technical Data Sheet.

LTP Mattstone H20 is applied to the surface with a paint brush, allow to absorb for 15 minutes and then apply a second coat. Remove any visible excess on the surface after 45 minutes.
For more information on how to apply please see the Technical Data Sheet.

 

Please note that this information is offered as general guidance only and without guarantee. Your specific circumstances may need an alternative approach. In case of doubt, any process should be tried out in an inconspicous area before general application. 

Sealing Stone Outside.

Limestone, Sandstone, Travertine, Marble, Slate, Granite, concrete:
Regardless of what type of flooring you choose, the likelihood is it will require some form of sealing.

This is because natural stone is porous, and therefore if left unsealed, any moisture will be soaked up by the stone making it very difficult to remove, and potentially leaving the surface permanently stained (sometimes even fallen leaves can cause stains).

The best way to prevent all this is to seal the stone.

When you seal a stone, you are essentially filling any voids or pores of the stone with the sealer. This prevents any further liquid to absorb in to the tile, as demonstrated here with this close up shot of a water droplet on a tile sealed with LTP Mattstone.

When sealing natural stone outside it is important to use a breathable impregnating sealer, this will allow the transition of moisture from underneath.
Examples include LTP Mattstone H20 & LTP External Stone Sealer both are water based breathable sealers and ideal for use outside.

It is important to note that all stones located outdoors are susceptible to a condition known as efflorescence.
This blooming is caused by water moving through the substrate of a material and carrying minerals and salts found in the mortar bed, grout, soil or the stone itself.
We have a blog here all about efflorescence.

Its also very important when laying Natural stone to make sure that its fixed on a full bed of adhesive and not spot fixed.
The end result could look like this if its spot fixed.
Spot fixing issue Sandstone

If this has already happened to your patio, we have a blog here.

When sealing different natural stones, what will vary the most will be how many coats the stone will need before it is fully sealed.
Each stone exhibits different levels of porosity. A tumbled Limestone may have a higher porosity level than a Honed and filled Limestone.

Sealing natural stone with Mattstone H20

Shake bottle before use.

Test the porosity of your stone with water and a teaspoon, using the LTP porosity test.

Once surfaces are clean and dry, apply the product to the surface evenly using a sealant applicator pad, brush or soft cloth.

When sealing its important not to over apply the sealer and redistribute excess, avoid letting the sealer pool on the surface, as this can cause white marks to appear on the stone when it dries.
On highly absorbent surfaces apply several coats wet-in-wet.
After 15 minutes, remove any excess sealer with an absorbent cloth. Do not allow residues to dry on the surface.
Do not walk on the surface for 3 hours.

Sealing natural stone with External stone sealer.
Apply evenly to the surface using a foam roller or paint brush. On more absorbent surfaces apply further coats at hourly intervals until the surface is completely saturated. Remove any residual sealer if still visible after one hour.

Cleaning Tiles Outside

Before you start sealing your stone it is important to make sure your stone is clean and dry, other wise you will just seal in dirt and grime.

Old layers of sealer, dirt residues and light deposits of organic matter and algae must be removed from the surface and pores of the stone.

This can be done by either using LTP Grimex which is a intensive cleaner or LTP Mouldex Paving Cleaner.

To Clean with LTP Grimex, dilute 1:3 with water, apply to the surface with a sponge or water brush and leave to sit on the surface of the tiles for as long as it takes for the dirt to release. (5-30 minutes depending upon the level of dirt). If areas look as if they are drying out just add a little more solution to keep the area wet.

Agitate the surface with a stiff deck brush after approx 10 minutes (scrubber machines can be used).

Continue to scrub while adding clean water. Remove residues from the surface with water or scrubber machine.

Rinse thoroughly with clean fresh water to remove all remaining residues. Use a power washer if necessary.

Allow the surface at least 24 hours to dry before sealing.

To clean with LTP Mouldex Paving Cleaner, Shake well before use.
Surfaces to be treated should be completely dry before application.
Pour solution undiluted directly onto the pavers and spread out evenly using a sponge or paint brush, Garden sprayers can also be used and leave for a minimum of 1 hour.

Apply a little water and agitate with a stiff Deck brush or emulsifying pad to release the dirt and grime, and then rinse thoroughly using a hose or jet wash.
Some stubborn stains and black spot may require a longer treatment, in which case apply and leave on surfaces overnight. If some black spot remains after treatment, It should fade and disappear after a few days following the treatment. If not: re-apply. Keep pets off at all times during treatment. In case of contact with metals, fabrics and painted surfaces rinse with water immediately. Do not use on warm surfaces. Do not apply if rain is imminent. Avoid contact with ponds & plant life: if contact is made rinse well with plenty of water.

General Maintenance.
Weekly or daily depending on conditions, use a hose and a brush to remove any debris that may be lying on the stone.
Then annually if required use LTP Grimex, this will remove surface dirt and grime, possibly every 6-12 months depending on condition.
Dilute Grimex 1:3 parts water and apply the solution on to the surface and agitate.
Leave for 10 minutes before agitating again and then rinse with water.
Allow 24 hours to dry and then if necessary re-apply a light coat of sealer.

PLEASE NOTE: Always follow the detailed instructions on the product labels. Protect stone surfaces from contact with acidic substances. Do not use abrasive materials on honed or polished stones. Avoid using normal detergents or strong bleach cleaners on sealed surfaces as they will gradually remove the protective seal.

Please note that this information is offered as general guidance only and without guarantee. Your specific circumstances may need an alternative approach. In case of doubt, any process should be tried out in an inconspicuous area before general application.

 

How do I clean my external paving?

Featured

Patio’s can give that refined and uniform look to a garden area, a clean cut from grass to stone, and when newly laid they look fantastic.

olive-limestone

If you had them laid before the winter months however they probably won’t look the same now as they once did. With the amount of rain that we have had over the last few months, the probability is that you will have some form of green growth on the tiles.

This green growth is a mix of Algae, moss and lichen which builds up on the tiles, normally more common in areas of higher rainfall, as this is the perfect place for algae to grow, high rainfall and with areas for the algae to cling to.

However this isn’t the end of your patio, as this can be easily fixed with the correct tools.

Cleaning Patios With LTP Mouldex

Firstly you will want to brush the stone with a stiff bristle deck brush to remove any leaves, dirt or debris from the surface of the stone.

Making sure the area is now free of loose debris, pour LTP Mouldex direct on to the stone and spread out over the area with a brush or sponge. (Garden sprayers can be used)

Black limestone with LTP mouldex applied on it with a sponge.

Leave for a minimum of one hour, then add a little water and agitate with a emulsifying pad or stiff deck brush to help loosen algae, dirt and grime.

After a minimum of 1 hour, agitate with emulsifying pad.

After a minimum of 1 hour, agitate with emulsifying pad.

Rinse thoroughly with water. Garden hoses and jet washes can be used. Be careful though as jet washes force water at the surface at high pressures and can cause damage to some stones.
Some stubborn stains and black spot will require longer treatment, in which case apply and leave overnight.

Rinse well with plenty of water

Rinse well with plenty of water

Once fully dry, (normally 24 hours) we recommend sealing with LTP Mattstone H20, this will prevent moisture and organic molecules from absorbing into the surface.

Black Limestone once cleaned and sealed

Black Limestone once cleaned and sealed

LTP Mouldex is a highly effective HSE registered product which has been developed to Help restore natural stone and paving to its original colour.

Grey Limestone with LTP moudlex.

Grey Limestone with LTP moudlex.

KILLS & REMOVES:

  • Algae
  • Black Spot
  • Mildew
  • Mould
  • Lichen
  • Fungus
  • Pollution
  • Pollen stains

Anti-bacterial action helps prevent re-growth.

Suitable for use on all external stones and concrete paving.

Simple to use….apply and leave….scrub and rinse.

The fast acting formula will restore external paving and help prevent re growth.

Protecting stone surfaces after treatment with LTP Mattstone H20 will further reduce the possibility of black spot and mould spores from returning. It will also help prevent deep staining from falling organic matter and make any future cleaning much easier.

Grey Limestone After cleaning and sealing.

Grey Limestone After cleaning and sealing.

One 5ltr can will treat up to 50 sq.m deepending upon the extent of soiling.

LTP Mouldex 5ltr only £39.54 Inc VAT.  (click here to buy or find your nearest stockist)

2_73_e

For further information on the application of LTP Mouldex watch the video below.

Please note that this information is offered as general guidance only and without guarantee. Your specific circumstances may need an alternative approach. In case of doubt, any process should be tried out in an inconspicuous area before general application.

PROBLEMS WITH STEAM CLEANING LIMESTONE

The simplicity of water-based steam cleaning can be appealing, but repeated use of too much super heated water can lead to risks of residual staining, mobilisation of salts and corrosion of hidden particles of Iron within some limestone surfaces.

 

Mud vein in limestone magnified 120 Microns

Surface of a Limestone magnified by 120 microns

Steam can penetrate the small cracks and fissures on the surface of the limestone.
This does clean the limestone, but will also embed water into the surface.
Repeated cleaning using a steam cleaner can activate salts and weaken the stone over time. This can also lead to spalling or fragmentation of the surface.

Cleaning to expose new fissuresCOMPROMISED SEALER?
Surfaces that have been treated with an impregnating sealers can also be compromised. Steam cleaning does not normally remove the impregnating sealer, however repeated use can expose new fissures and capillaries within the stone. The newly exposed and unsealed surface takes in more dirt and becomes harder to clean, which then requires more frequent cleaning. This increase in cleaning can exacerbate the problem.

 

SURFACE SEALER DAMAGE?Damage to stone surface

Sealers used to finish the surface of stone can also be damaged. Steam is often used to remove paints, wall papers and other
coatings from surfaces. If a film forming
sealer has been used then contact by a
steam cleaner can cause a partial separation of the seal from the surface of the stone causing it to turn white or opaque.

 

                                                                        Rust stains in Limestone after spalling
RUST STAINS ON THE SURFACE?                                  
Rust stains:  These stains are reddish-orange and are caused by the oxidation (rusting) of iron. The source of iron staining is normally from within the stone, as most of the iron on the surface is normally
removed or discarded at the point of fabrication by the quarry. Therefore most Iron remains hidden and within the stone rather than on it; however, water from steam cleaning penetrating through natural fissures in the  stone can activate or accelerate rusting.
CRUMBLING OF THE SURFACE?
Moisture from repeated steam cleaning can in someSpalling Limestone
cases cause spalling or fragmentation of the surface.
The migration of salts from moisture in the limestone can promote crumbling of the surface causing larger fissures and craters to appear. This is more
common in Limestone’s and marbles that contain naturally occurring mud or calcite veins which are more vulnerable to this issue.

 

WHAT TO DO?

COMPROMISED SEALER: Intensively clean the surface of the stone with LTP Grimex. Leave overnight to dry. Re-apply impregnating sealer – LTP Mattstone or LTP Colour Intensifier. For routine aftercare use LTP Waxwash. This is a PH neutral cleaner that will not damage the stone or compromise the seal.

SURFACE SEALER DAMAGE: Remove the Film forming sealer using LTP Grimex or LTP Solvex. Leave overnight to dry. Re-apply the film forming sealer – LTP Ironwax Satin or LTP Ironwax Gloss. For routine aftercare use LTP Floorshine. This gentle cleaner will clean the surface and repair the seal where it has worn from abraision every time the floor is washed.

RUST STAINS ON THE SURFACE: Intensively clean the surface of the stone with LTP Power Stripper. Leave overnight to dry.Re-apply impregnating sealer – LTP Mattstone or LTP Colour Intensifier. For routine aftercare use LTP Waxwash. This is a PH neutral cleaner that will not damage the stone or compromise the seal.

CRUMBLING OF THE SURFACE: Intensively clean the surface of the stone with LTP Grimex. Leave overnight to dry. Use a suitable resin stone filler of the correct colour to fill in the voids. Re- hone the surface of the stone using a twister pad and sponge down with a little water to remove any dust or sediment. Leave to dry. Re-apply impregnating sealer – LTP Mattstone or LTP Colour Intensifier. For routine aftercare use LTP Waxwash. This is a PH neutral cleaner that will not damage the stone or compromise the seal.

This information is offered without guarantee.  The material should be used so as to take account of the local conditions and the surfaces to be treated.  In case of doubt, the product should be tried out in an inconspicuous area.

Sandstone-Fixing & Sealing Outside.

Featured

We have recently been contacted by numerous customers who have been having problems with spot stains appearing on their sandstone patios.

Sandstone Flags with Spot Fixing Issues.

Sandstone Flags with Spot Fixing Issues.

This is a common problem, so we thought we should share why and how this issue sometimes occurs. The pictures in this post are supplied by customers showing the problems that are occurring.

 

Understanding Sandstone

Many of the imported sandstones, and some limestones and granites,are very porous. If fixing natural sandstone or limestone outside DO NOT SPOT FIX!!

They are not man made concrete pavers and should not be treated the same.

The sandstone should be fixed to an even mortar bed and then each piece of stone back buttered for a solid fix…

This will help illuminate possibilities of staining from moisture and mortar.

Natural stones like sandstone are not as dense as concrete pavers and are full of microscopic capillaries. These capillaries can draw up moisture from mortar through to the face of the stone. The moisture dries out to leave a deposit of mortar residue and minerals within the pores of the stone.Img3701 Sealing too soon after spot fixing can sometimes highlight these issues and also slow down the transition of moisture, suspending the cement residues within the stone.

The introduction of moisture from rain can also further highlight these issues. This is because the moisture collects and dwells within the voids between the mortar spots underneath the stone. As it dries out and the moisture rises carrying more minerals from the sand and cement to the surface of the stone.

Most sealers used for outside use are breathable and allow microscopic transition of moisture, so any trapped moisture is still able to dry out should it become trapped beneath the stone. Sealing does not cause the issues associated with spot fixing nor should it be considered a method for covering up the stains should they occur.

If your stone pavers have been spot fixed, then we would suggest not sealing them for at least 3 months after installation. This should allow for any mortars to full harden and any released minerals to completely dissipate. Clean surfaces well using LTP Power Stripper and leave to dry for 24 hrs. Test the sealer on a small area before general application to make sure that the mortar spots are not highlighted and after a few days make the test area wet and allow it to dry out. If staining does not occur the rest of the surface can be sealed.

If your stone has been fixed correctly into a solid bed then we would suggest a drying time of two weeks before sealing. This should allow enough time for all mortars to fully dry. Solid fixing will not allow any rain water to sit beneath the pavers and dwell. Clean surfaces well using LTP Power Stripper and leave to dry for 24 hrs. Seal using an impregnating sealer and apply as many coats as necessary to completely saturate the stone.

When sealing using an impregnating sealer it is important to remember that the solution needs to fully absorb into the stone without drying on the surface and do not apply in direct sunlight. If sealer is still visible on the surface after 45 minutes saturation has been achieved and any excess should be toweled off. For best results allow at least 3 full dry days after treatment.

 

LTP IMPREGNATING SEALERS SUITABLE FOR EXTERNAL USE

LTP MATTSTONE H20

LTP EXTERNAL STONE SEALER

LTP STONE OIL

 

CLEANING SANDSTONES & LIMESTONE  WITH SPOT FIXING ISSUES

Use: LTP Power Stripper

Apply undiluted to the surface of the stone and agitate using a black emulsifying pad. Add a little water and agitate again. Leave the solution on the surface of the stone for 15 minutes and agitate again. Rinse well with water. Repeat until the stains are no longer visible. Leave to dry for a minimum of 24 hours before sealing. Before re-sealing the whole area test the sealer on a small area before general application to make sure that the mortar spots are not highlighted. Leave to dry and after a few days make the test area wet and allow it to dry out. If staining does not occur then the rest of the surface can be sealed.

CLEANING MORTAR STAINS FROM SANDSTONES AFTER POINTING

Use: LTP Grout Stain RemoverGrout_Residue_Remover_Pack2

Apply un-diluted onto the surface of the stone and agitate immediately using a black emulsifying pad to release the mortar stains from the surface of the stone. Using a sponge and water rinse well immediately after use and change rinsing water after every 5 sq/m.

MOULD, MILDEW AND BLACK SPOT

Use: LTP Mouldex

Spray LTP  Mouldex onto the surface of the stone and leave for 1 hour. Using a black emulsifying pad agitate the surface and rinse well with plenty of water. Repeat until all organic matter has been removed. Re-seal surfaces once thoroughly dry.

This information is offered without guarantee.  The material should be used so as to take account of the local conditions and the surfaces to be treated.  In case of doubt, the product should be tried out in an inconspicuous area

 

How to remove staining from Black Limestone before sealing.

Visible stains on Black Limetone

Visible stains on Black Limetone

After quarrying, milling and then packing a black limestone it is possible for residues of moisture and sediment to remain on the surface. If left over a period of months these deposits of mineral and sediment absorb into the pores of the stone. This type of staining can be very difficult to remove using conventional cleaning materials. The following is a guide to help restore the                                                                                     appearance of the stone using a strong                                                                                   cleaner and then sealing to restore and                                                                                   enhance the colour.

DIRECTIONS FOR CLEANING AND SEALING

1. LTP Grout Stain Remover is applied and 2. GSR scrub immediatelythen immediately scrubbed into the surface using a black emulsifying pad. This should be done for 1 – 2 minutes making sure to cover the whole surface of the stone. This cleaner will slightly etch the surface of the stone to release the stains from within.

 

3. Rinse well with plenty of water2. Do not leave the cleaner to dwell on the surface. Rinse with water immediately after scrubbing. Change the rinsing water every 5 M².
After cleaning leave surfaces to dry for 24 hours.

 

4. Leave to dry
3. Once dry, surfaces will appear grey rather than black. The stains should no longer be visible. The surface of the stone has been conditioned ready for sealing.

 

5. Apply Stoneoil4. Apply a small amount of LTP Stone Oil to the surface of the Limestone and spread out evenly. Leave to absorb into the surface of the stone for 1 hour. Any visible excess after this time work should be worked off using a soft absorbent towel.

6. Spread out evenly

5. The sealer should be left to dry for a minimum of 24 hours with light traffic only.
It will take a further 3 days to reach full hardness, so surfaces should be kept as dry as possible during this time.

INTERIORS
Finishing the stone with a light coat of LTP Mattstone should be considered if the stone is to be used in kitchen areas.

INITIAL CLEANING:                LTP GROUT STAIN REMOVER                   1ltr & 5ltr

This should be done after fixing and before sealing LTP-GroutStainRemover5L&1L_2011_Weband grouting to remove calcium carbonate and mineral deposits including dust and dirt that has accumulated during the production and fixing process. Apply undiluted solution to the surface of the stone and agitate immediately with an emulsifying pad. Rinse thoroughly with a separate pot of clean fresh water. Wipe away the released calcium dirt and grime with a mop or sponge and water and leave to dry for 24 hrs.

TDS – http://www.ltp-online.co.uk/images/tds-Grout_Stain_Remover.pdf

MSDS – http://www.ltp-online.co.uk/images/msds-Grout_stain_remover_clp_GHS.pdf

SEALING:                                      LTP STONEOIL                                        1ltr & 5ltr

Before grouting apply a light coat of LTP Stone Oil, LTP-StoneOil5LTin_1L_Grp_Webcheck that all of the sealer has been
fully absorbed within 1 hour, any excess that remains on the surface after 1 hour should be worked in with a soft cloth or buffing machine. Leave for a further 4 hours or overnight before grouting the joints. Once all residual grout has been removed and the surface and joints are thoroughly dry; apply a final light coat of StoneOil covering the joints as well. Buff to remove any excess within 1 hour and then leave for a minimum of 3 days to fully harden before making excessively wet.

TDS – http://www.ltp-online.co.uk/images/tds-Stone_Oil.pdf
MSDS – http://www.ltp-online.co.uk/images/msds-Stone_oil_clp_GHS.pdf

IMPORTANT NOTES:
When cleaning or sealing vertical surfaces always start at the top and work down.
Provided that the surfaces are correctly sealed and maintained protection should last 3 – 4 years before considering applying a top up coat. Sealing will not prevent wear from abrasion.Used externally sealers will last between 1 & 2 Years before light cleaning and topping up.
After Intensive cleaning to remove any ingrained dirt or other staining and once dry, always test for moisture ingress. If evident cleaned areas should be re-sealed.
When using LTP Grout Stain Remover, gloves should be worn.
For detailed application instructions please see Technical Data Sheets.
This information is offered without guarantee. The material should be used so as to take account of the local conditions and the surfaces to be treated. In case of doubt, the product should be tried out in an inconspicuous area