J-B Weld Ultra Bond WaterWeld Epoxy Putty Stick, Off-White, 57-g

The "Waterweld" off-white epoxy putty stick from J-B Weld is made for underwater repairs, effectively plugging, sealing leaks, and patching holes and cracks in almost any material. It's ideal for fixing plumbing, fuel tanks, tubs and showers, drains, pools and spas, boats, and potable water tanks. It sets quickly and can be worked on after an hour. The putty cures to an off-white colour and is available in a 57 g format.