Rich, it sounds crazy, but it did work (on this stuff, anyway!) No doubt be carefull if anyone tries this!! On the train layout I did this on, it was all open, no (major) fire hazards.

I just waterproofed the inside of a Dumas Chris Craft boat with thinned epoxy, and bubbles were popping up all over. I was huffing and puffing on it to see if the "hot breath" method worked with regular epoxy (Bob Smith 30 min thinned w/ alcohol). Either it really did work, or it merely seemed to since I was high from inhaling the alcohol fumes with a combination of hyperventilation!