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Product Reviews
By Simon Escott

Very good product. As mentioned by others you have to make sure you clear of excess and this takes effort. Now real test as winter approaches. In hindsight personally maybe should have gone for colour enhancer or wet look sealer to show off effort of looking after stone!

By Alfred Blair-Smart

The contractor who laid out the back garden left it to me to seal the sandstone and I am glad that I found Smartseal. It effectively seals and enhances the stone without any discolouration when finally dry. An excellent product which I can thoroughly recommend.

By Andrew CharlesFROM London

Having used the Indian stone cleaner and natural stone sealer before and not getting the longevity in the product I thought I would, I decided to give it one more try. I found it okay but it now seems very expensive compared to other products on the market,which I have also tried and found to be just as good. The sealant is easy to apply but the cost of covering a medium size patio I found to be very expensive. So would I use it again ? probably not

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Natural Stone Sealer - DRY FINISH

High Quality, Impregnating & Breathable | Durable Sealer for Sandstone, Limestone , Slate, Stone Internal & External

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Visa Electron
Product Description

Natural Stone Sealer with a 'DRY' Invisible Finish

Effective impregnating sealer for sandstone, limestone, granite and slate

Smartseal Indian Sandstone Sealer and Natural Stone Sealer is a high quality, clear, solvent free acrylic impregnating, breathable coating system. Application of the sealer will alter the chemical structure of the porous sandstone or natural stone providing a excellent water repellent and stain resistant surface.

  • One coat application to saturation, or for best results, apply a second coat once 'touch dry'
  • Resistant to algae, lichen and staining
  • Dry finish
  • Average coverage: 1st coat 4 - 8 m per litre ( 4m2 Sandstone- 8m2 Slate & Granite) 2nd coat 8 - 16 m per litre (dependant on porosity and finish of the surface)
  • Application by roller or sprayer
  • Touch dry 2 - 3 hours
  • Fully waterproof 24 hours
  • Suitable for Sandstone, Limestone, Terracotta, Travertine, Slate and Granite
  • Can be used externally or internally

PREPARATIONDue to the effects of Efflorescence and Natural Salts and Minerals, that can permeate through Natural Stone, it is recommended not to seal for a minimum 4 months after installation.

Pre treat surface with appropriate cleaning product. If required, fully clean off using a pressure washer and leave to dry thoroughly for at least 3 days. In order to apply sandstone or natural stone sealer, the area must be clean, dry and free from contamination

Always test product on-site, in an inconspicuous area, to ensure you fully are satisfied with the final appearance/ colour of the surface.

**If applied to a surface where a "sweep-in" pointing compound has been used within the last 6 months, the natural stone must be fully cleaned with Smartseal Residue Remover prior to sealant application.**

APPLICATION NOTE: Application on vertical surfaces should be to full saturation commencing at the bottom and working upwards. Do not apply in damp conditions and only apply to dry surfaces in temperatures above 13C and no higher than 23C. It is very important to make sure no rain is forecast for at least 8 hours after application. 

Depending on the stone/surface, more than one coat may be required. For most porous stones, a 2nd lighter coat can be applied once touch dry (slightly wet). If over application does occur on either coats, excess sealer can be removed with a dry roller or sponge. Ensure this is done within 45 minutes.

  1. Shake container well before use
  2. Ensure that surface area is completely clean from dirt & grime.
  3. Allow surface area to dry, will take 3 dry days depending on the weather.
  4. Apply 1st coat to saturation by roller, sprayer or brush.
  5. Apply 2nd lighter 'mist' coat (approx 45 minutes after 1st coat if suitable).
  6. If over application does occur, please remove excess sealer with a dry sponge or cloth.
  7. Avoid walking on surface 4 hours after application and 48 hours for heavy traffic.

All equipment should be cleaned with water immediately after use.

SHELF LIFE: Store away from direct sunlight and sources of heat. Protect from frost.
12 months shelf life (in original sealed container). Once opened use within 3 months.

Product FAQs

Q: I have an inglenook fireplace with what I think is a sandstone hearth (not 100% sure). Really nice mat sandstone colour. I want to seal the hearth slabs to prevent staining should anything come down the stargazer chimney (stainless liner for my log burner fitted) can you recommend a suitable product. I don’t not want the colour or appearance of the hearth slabs to be changed.

John wall

A: The natural stone sealer DRY finish should seal the sandstone without changing the appearanace. We also have a solvent based natural stone impregnator which would give enhanced stain resistance. We would always recommend carrying out a test patch first to determine if the product meets your expectations as sometimes any one of these products could change the colour of the substrate.

Response from Nick

Q: Hi We recently had windows installed in an old sandstone building. Our builder would like us to use a sealant on the inside of the window surround (about a 3-4 inch strip), could you recommend something. Thanks

Joanne Cross

A: The natural stone sealer in a dry invisible finish would be the most suitable product to use. It can be applied and not alter the appearance of the surface.

Response from Nick

Q: Hi, I've created a water feature (pondless waterfall / stream) using sandstone (probably not the best idea) and want to seal it as losing to much water to the stones (have about 40-50 rocks). Would this be suitable and is it safe for pets as they regularly drink from the waterfall/Stream? Thanks, Andy


A: This product is a sealer that provides a water resistant barrier. To fully water proof a substrate, you need a sealant. Maybe a aquatic centre would able to recommend a suitable product. Hope that helps.

Response from Alex
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We provide a national delivery service for our block paving sealer, pattern imprinted concrete sealer, roof coatings and tarmac restorer on a standard 2 - 4 working day basis. Dependent on weight, this is normally done by pallet or parcel carrier.

If you need products delivered quicker, for a small additional charge, orders placed before 1.30pm can be delivered within 1 - 2 working days to most parts of the UK, although this is dependent on the courier service in your area and the product/s ordered. If you require this service, please check on area availability by calling 01268 722500.

Our commitment is to supply all orders as placed and we offer a comprehensive guarantee of quality. Providing a reliable delivery service to all our customers is most important to us and this is backed up by the many satisfied customer testimonials we have received over the years.

If you need an order delivered to a different address, left somewhere at your property without a signature or left with a neighbour, just let us know.

We also try to maintain 100% stocking levels of our products at all times, so an immediate despatch is virtually guaranteed.

Our product returns policy can be viewed by visiting our Terms and Conditions section.

*Free delivery on orders over £75 are subject to the delivery address location.

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