J-B Weld is the original Cold Weld Two-Part Epoxy System that provides strong, lasting repairs to metal and multiple surfaces, according to the company. 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 20-25 minutes to a dark grey color. A full cure is reached in 15-24 hours. J-B Weld has a tensile strength of 3960 psi and sets to a hard bond overnight. It can withstand temperatures up to 550 degrees F when fully cured.