J-B Weld® 8281 Steel Reinforced Cold-Weld Epoxy, 10 OzJ 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 PSI and sets to a hard bond overnight. It can withstand