The Underwater Magic Sealant Gray is a professional-grade adhesive formulated to perform underwater, with no draining required. This solvent-free, silicone-free formula cures into a strong, flexible seal that resists chlorine, saltwater, UV exposure, and harsh weather, making it ideal for everything from emergency leak fixes to long-term structural repairs. Safe, odorless, and non-toxic, it bonds to a wide range of materials including tile, vinyl, fiberglass, and concrete.