J-B Weld WaterWeld epoxy is designed to plug or seal leaks and patch holes and cracks in almost anything. It's ideal for repairing plumbing, fuel tanks, tub and shower drains, pools and spas, and boats and portable water tanks, and is even capable of setting underwater. It can be drilled, tapped, filled, sanded, and painted. It sets in just 15 to 25 minutes and fully cures in an hour. J-B Weld WaterWeld epoxy is rated at 900 psi tensile strength and can withstand temperatures of up to 300 degrees F.