You can also make a hotbox out of blue foam with a couple of 100 watt light bulbs and a dimmer switch to control the temp. This will post cure the resins and should take out much of the shrink. I am glassing the fuse of a pattern plane now and after the 2nd coat of resin, I wrapped it up in an electric blanket for 4 hours. i wil sand smooth, cook again, then prime and sand, then cook again.