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Seal leaks, fix cracks and holes with the J-B Weld Epoxy Putty. You can use this water weld epoxy putty for plumbing or repairing tubs, shower, drains, fuel tanks, marine, boats, and potable water tanks. It can withstand temperatures of up to 300 deg. F, and prevent the surface from extreme heat and moisture. With a cure time of an hour, it sets hard to form a surface which can be drilled, tapped, filed, sanded, and painted.