Plug holes and make permanent repairs under water and in gas tanks -- while they're still leaking! Drinking water safe. Surfaces do not need to be clean and dry for application. What does it bond to? Virtually any combination of iron, steel, copper, aluminum, brass, bronze, pewter, porcelain, ceramic, marble, glass, PVC & ABS, concrete, fiberglass, wood, fabric, paper -- just about any porous and non-porous material.