I purchased a 2 gallon two part resin and tried it today. I had a tiny amount of it that I put into an empty watch body. It bubbled so much and set promptly so that it was basically a large raised layer of bubbles above the watch face. I sanded it down but found that the bubbles went all the way to where I poured the liquid prior to it foaming. This is really troubling. It set too quickly to even consider putting in a chamber, and the foaming makes it seem like it would be dangerous to use on large molds.