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How to seal a sandstone patio

How to seal sandstone: a how to guide

What’s the best Sandstone Patio Sealer?

If you wish to seal a sandstone patio, we believe the best product to do this is Floorseal Indian Sandstone Sealer & Colour Intensifier.

Indian Sandstone Sealer & Colour Intensifier is suitable for sealing any form of sandstone, including Indian sandstone & York sandstone.

This product has been warmly received with many 5 star reviews on Trustpilot & Amazon. To see further product information and prices please click on the product title highlighted in blue, or click through to the main website

Indian Sandstone Sealer & Colour Intensifier is a water-based breathable sealer. In addition, it contains a secondary element, which highlights natural veining and colour variation. This sandstone sealer creates a natural matt finish with increased colour.

Indian Sandstone Sealer & Colour Intensifier produces a subtle natural finish on any sandstone paver. If there is colour and interest noticeable within the stone, this product will highlight its appearance.

Sandstone patio sealing before and after.

How does this type of sandstone sealer work?

This sandstone patio sealer is primarily an impregnating sealer. As the name suggests the sealer soaks into the stone and becomes meshed into the surface. In other words, the product waterproofs by being ‘in’ the stone not ‘on’ the stone.

Indian Sandstone Sealer & Colour Intensifier is also a colour enhancer. It is the enhancing element of the solution which slightly darkens the stone, thus enhancing colour.

You could say it is a little like dampening the stone but without an associated shine. Another analogy might be to say it’s like oiling wood; It is a process that increases colour but retains the natural appearance of the material.

The sandstone will always retain a natural matt finish. Its purpose is to seal, retain breathability and increase the natural colour already contained within the stone.

Apply sandstone patio sealer.

The benefits of using breathable sealers

The benefit of an impregnator, or an impregnator which also contains a colour enhancer is that it never needs stripping. Indian Sandstone Sealer & Colour Intensifier can be reapplied without stripping. All that is required is a basic clean, then reapply the sealer as normal.

You can apply the sealer almost as soon after a patio is laid. Any vapour being released from the base materials can escape through the stone. Vapour transmission usually occurs during the first 6 weeks, perhaps up to a year after laying.

This Indian stone sealer is resistant to water and oil penetration. It will also inhibit organic growth like black spot lichen, algae and moss.

The product is easy to apply, rapid drying, solvent & VOC free, therefore low odour. It is suitable for use by both DIYers and contractors.

This product does not flake, blister, crack or peel. It cannot cause moisture clouding as it is not a surface coating or lacquer.


Always carry out a small test patch to assess how the colour of the stone will be affected.

Do not to apply when the air and stone temperature is below around 10°C or above 20°C. Remember sandstone, like most natural stone, is a good conductor of heat.

Natural stone will warm through the day and retain heat into the evening, it is probably at its coolest first thing in the morning.

Do not apply the sealer to damp stone and make sure the surface is clean before applying.

Spray, roller or brush onto the surface and allow the sealer to soak in. Use microfibre cloths to remove any excess. The excess may pool in the low spots on the surface of the stone or in the joints. To minimise this, we recommend the pump sprayer for consistent and easy application.

Use microfibre cloths to remove any excess sealer.

You must remove any excess before it comes tacky, typically after around 10-30 minutes. Please adjust the time allowed for excess removal based on air and surface temperatures. Your test patch could be used to assess this timing.

Apply more product approximately 40 minutes after the first application. You can apply the sealer more sparingly during this second consecutive application as the first application will already be taking effect.

Please note: The stone will not accept the same volume of sealer during this second application. Again, remove all excess sealer with microfibre cloths.

Always apply the second treatment within approximately an hour of the first. Do not apply on separate days as the first application will have now cured.

This product will cure in 24 hours, but it will accept light foot traffic as soon as its dry.

Pre-cleaning the sandstone

If you are sealing a sandstone patio which has been pointed with a jointing compound, or will be pointing with this product, ensure any residues are removed. There are various types of ‘sweep in’ style compounds many are resinous. With care, they do not mark the stone and some residues naturally weather off.

To ensure all residues are removed we recommend pre-cleaning with Floorseal Sealer Residue Remover, particularly if you have used a brush in compound. It is a modern eco-friendly non acidic cleaner for the removal of dirt, grime, resin residues & very light cement/grout hazes.

Sealer Residue Remover will also remove light non-visible contaminations of ‘brush in’ style compounds. Brush in compounds can leave an invisible resinous slick around the joints which should be broken down. Please note, some 2-part resins and resin in generally can be impossible to remove with a cleaning fluid if severe!

If you have pointed your patio with a traditional sand and cement mortar pre-clean with Floorseal Cement & Grout Haze Remover. It will remove general cement staining from traditional mortars. Always work from weaker diluted solutions to stronger concentrations. Test the solution before proceeding to apply across the entire area.

If you are planning to clean then seal an existing, possibly older patio, please pre-clean with Floorseal Black Spot Remover Plus. This product will remove organic contaminations, this includes black spot lichens which are impossible to remove by jet washing alone. This product is highly effective and can be followed up with Moss Remover Plus – This will prevent lichen spores from germinating in the future it can be applied before or after sealing.


Floorseal Sandstone Sealer & Colour Intensifier is the most popular product for sealing sandstone. There are several factors that contribute to this popularity; such as it being water-based, eco friendly, VOC free, low odour and very easy to apply. This sandstone sealer produces a natural but enhanced matt finish.

It is not a topical surface sealer so never requires stripping before reapplication, it does not trap moisture. It can be applied to older pavers and to newly laid pavers, it allows moisture vapour transmission.

5 litres of Indian Sandstone Sealer & Colour Intensifier covers approximately 25m2 – 30m2. Please allow for variation due to the individual level of porosity found on different sandstones.

*If you have a Kandla Grey sandstone, or plain grey sandstone please contact us for advice. They can easily be sealed but may require a slightly different kind of sealer – more in this dedicated blog article.

Indian Sandstone Sealer & Colour Intensifier is available in 1, 5 & 20 litre sizes

Indian Sandstone Sealer & Colour Intensifier is available in 1 litre containers, 5 litre containers & an economy busting 20 litre container.

Further information

Please Click Here to view our products & accessories for cleaning and sealing a sandstone patio. This includes all of our handy ‘how to’ guides for cleaning and sealing any exterior or interior sandstone.

The information contained within this article is not exhaustive. If you need further information please contact Floorseal on (01484) 861461 or our website address is