511 Anti-Slip Formula is a penetrating sealer designed for the anti-slip protection of all tile and stone surfaces. 511 Anti-Slip Formula is not a surface coating and will not alter the natural look. All surfaces treated are less slippery. SLIP PROTECTION FOR: Granite, Marble, Limestone, Travertine, Natural Stone, Ceramic Tile, Grout, Porcelain Tile, Slate. SPECIAL FEATURES: Interior & Exterior Use. Weather Resistant. Easy-to-Use. Safe for Food Areas. Best Performance.