UltraCare Penetrating SB Stone, Tile & Grout Sealer is a natural-look, solvent-based penetrating sealer that provides maximum protection against most common stains. It is safe for use on all interior and exterior natural stone (marble, limestone, sandstone, slate, granite, travertine, etc.), unglazed porcelain and ceramic tiles, masonry, quarry tiles and cementitious grout. The product can also be used as a pre-grouting sealer.