J-B weld 10 oz. Professional Size Steel Reinforced Epoxy Twin Pack. 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 PSI and sets to a hard bond overnight. It can withstand temperatures up to 550§F when fully cured. Great for household repairs, automotive, plumbing, marine, crafts and more. Use on automotive, brick, concrete, epoxy and adhesives, metal and more.