Penatrates deep to seal out air, water, and moisture. Once dry, it turns into a strong, flexible, watertight, rubberized coating..Can be applied underwater and it even dries underwater. Super thick rubber paste that clings to the surface and instantly fills large gaps, cracks and holes. Once fully cured, it can be painted any color. UV resistant. Helps prevent rust and corrosion. EXCELLENT FOR:cracks & holes, foundation & concrete, bath & shower, indoor and outdoor projects, roof, RV, motorhome, auto, marine, lawn & garden projects, DIY, hobbies, and much more! RECOMMENDED SURFACES:Wood, Glass, Tile, Concrete, Aluminum, Metal, Brick, Stucco, Masonry, Copper, Fabric, Fiberglass, Ceramic, Porcelain, Natural Stones,.