Review by the Guardian.  If you want to do it yourself, go for a top-quality sealer that needs only one coat. Ultimate Sandstone Sealer  (from sealer-seal-sealant.co.uk, seals all Sandstone and Indian Stone surfaces. Stephanie Zia.

This is the first choice sealer of the trade and our best seller - Perfect for all types of Sandstone and Indian Sandstone Tiles, Paving and Worksurfaces. You will be amazed at how good this sealer performs with just 1 coat..

Benefits of Ultimate sealer. Repels all liquids, prevents frost damage, protects against staining, non slip finish, No harmful smells or residue are left. Ultimate Sandstone sealer Lasts up to 15 years, Important - Only 1 good coat required. Also available in Satin, Colour Enhancer & Wet Look Gloss Finish. 

Ideal for interior and exterior Sandstone and Indian Sandstone, Apply with brush, cloth, roller or Spray gun. Wash all brushes in soapy water.

1 litre covers 8 to 10 sq metres per litre

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