Please- do not use a torch on the molds. 

Torching in the Silicone Mold with break down the silicone and eventually cause it to fuse to the Epoxy resin and tear the mold. Silicone can withstand 500F, torches put out 2800F. Even a rapid pass from 6"-8" will be enough to break down the Silicone Mold with repeated abuse.