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 5020 PSI and sets to a hard bond overnight. It can withstand temperatures up to 550ºF when fully cured.