A two-part system, J-B Weld’s epoxy makes strong, lasting repairs to metal and other surfaces Ideal for household, automotive, plumbing, and marine repairs, as well as for arts and crafts, and other projects requiring adhesives The two tubes are easily mixed at a 1:1 ratio, forming a permanent bond that can be shaped, tapped, filed, sanded and drilled after curing It takes only 4-6 hours to set in room temperature — with a full cure reached in 15-24 hours — at which point it can withstand temperatures of up to 550 degrees Fahrenheit J-B Weld epoxy has a tensile strength of 3960 PSI, and cures to a dark grey colour