BowEd I always seem to get the shellack stuck to the caul, but once I break it loose I always also get springback. Don't know how hot my heatgun gets but is a porter cable 1500 watt gun. But I never have seen my shellac bubble up and cooked off the bow like when cooked over coals. It scared me a bit the first time as I thought I had ruined another bow. Always had a hard time getting hickory to take reflex with my gun but now I have a way of inducing it. That is why this old method that is new to me ecites me a bit. If the bows don't try to get a little bit sluggish during the summer heat being stored in my shop I will definately be hooked. Just another method I learned to use in building bows. I also have enough hickory on my place to build as many as I should ever need. Can't wait to try the sweetgum, that is ome tree Ive always considered trash, got plenty of it too. Thanks