It sticks Cecil as you well know! Anything you use to adhere the two pieces of foam is going to stick when carving with a knife. The gas or L.T. gums up and creates the same issue. Plus, you HAVE to paint the form with latex paint or something to hide the seams for thin skinned fish like trout. That's why I don't like using pieces of foam glued and opt to buy the big 10"x20"x96" blue billets instead. My supplier will cut them down the middle to make two, 5 inch thick pieces for free. Which I have done for most. But, save one or two 10 inchers for those REALLY big fish!