511 Porcelain & Ceramic Tile Sealer is an impregnating sealer designed for the protection of all porcelain and ceramic tile surfaces. 511 Porcelain & Ceramic Tile Sealer forms an invisible barrier that is resistant to moisture and stains while allowing vapor to escape. 511 Porcelain & Ceramic Tile Sealer is not a surface coating and will not alter the natural look. All surfaces treated are harder and less slippery. WATER, STAIN & SLIP PROTECTION FOR: Porcelain Tile, Ceramic Tile, Quarry Tile, Grout, Glazed Tile. SPECIAL FEATURES: Interior & Exterior Use. Safe for Food Areas. Easy-to-Use. Will Not Yellow. Grout Release. Weather Resistant. Superior Coverage. U.V. Transparent. Oil & Water Resistant.