We recommend using UltraCare Penetrating SB Stone, Tile & Grout Sealer on all cement-based grouts, porous natural stone, clay tile, cement-based tile, quarry tile, brick and polished porcelain tile. This sealer leaves the surface unchanged in appearance, is breathable, and doesn’t peel, flake or darken the tile or grout. Once fully cured, it helps protect against the absorption of both water and oil-based contaminants, making the surface easier to clean and maintain.