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J-B Weld is the original cold weld two-part epoxy system that provides strong, lasting repairs to metal and multiple surfaces. Mixed at a ratio of 1:1, it forms a permanent bond and can be shaped, tapped, filed, sanded and drilled after curing. At room temperature, J-B weld sets in 4-6 hours to a dark grey color. A full cure is reached in 15-24 hours. J-B weld has a tensile strength of 3960 lbs. per square inch and sets to a hard bond overnight. It can withstand temperatures up to 550 degree Fahrenheit when fully cured. THE ORIGINAL COLD WELD: JB Weld was developed as an alternative to torch welding. Designed to be effective in extreme environments, once it sets, it creates a permanent bond stronger than steel.EASY TO USE: Mixed at a ratio of 1:1, it forms a permanent bond and can be shaped, tapped, filed, sanded and drilled after curing. At room temperature, J-B Weld sets in 4-6 hours to a dark grey color.VERSATILE & DEPENDABLE: J-B Weld has a tensile strength of 3960 PSI & sets overnight. It can withstand temperatures up to 550ºF when cured. Great for use on brick, concrete, metal, fiberglass & moreDO IT YOURSELF: Big or small, you can DIY it with J-B. Our heavy duty adhesives repair & restore it right the first time. JB Weld delivers the legendary performance of the World's Strongest Bond.Waterproof, petroleum, chemical, and acid resistant when fully curedWill set in 4-6 hours, and cure in 16-24 hours