All porous mineral building materials will benefit from being sealed. Inclusive of stone, masonry, tile, concrete and grout.
Topical sealers provide a thin film over the surface, which in turn, will darken the treated surface. These coatings wear quickly and can make the surface slippery when made wet. A topical sealer must also be stripped off when time comes for re-application. These coatings will also block the pores of the surface and can trap salts and water just beneath the surface which may cause the coating to peel or go cloudy.
There are impregnating sealers that repel water and those that repel both water and oil based stains. Usually impregnating sealers will not alter the appearance and not make any change to the slip resistance of the surface but will not completely stop dirt and rubber getting into the open pores of the surface.
When you make comparison to similar sounding impregnating sealers, the two most important questions are: how long will it last and how deep does it penetrate into the surface? The deeper the penetration, the better the sealer. Drytreat sealers are the best on the market. Don’t just believe their website and guarantees, check out sealing forums from around the world.