After mixing, it forms a permanent bond and can be shaped, tapped, filed, sanded and drilled after curing.J-B KwikWeld has a 1:1 mixing ratio, sets in 6 minutes and is fully cured in 4-6 hours and cures to a dark grey colour, is rated at a tensile strength of 2424 PSI and will withstand temperatures up to 300¼F.