JB Weld Waterweld 2ozJ-B Weld's WaterWeld Epoxy Putty quickly plugs or seals leaks, holes and cracks in almost anything. Repairs plumbing, fuel tanks, tub and shower, drains, pool and spa, boats and potable water tanks, It can be applied and sets up even underwater. Once fully cured, it can be drilled, tapped, filed, sanded, and painted. WaterWeld has a set time of 25 minutes and sets hard in one hour. WaterWeld cures to an off-white color, is rated at a strength of 4370 PSI and will withstand water pressure up to 500 PSI and temperatures up to 250F.How to use Mix - Thoroughly knead putty with fingers to a uniform color.; Apply - Press putty firmly to the surface to be repaired; Product Specification Strength - 4370 PSI; Start Time - 25 Minutes; Cure Time - 1 Hour; Dry Color - Off White; Metal - Aluminum ; Can be used under water/Wet , Fiberglass, and Automotive;