No, they slid RIGHT out of the molds, and I only noticed a couple bubbles coming up to the surface while cooling. Sooooooo.... for testing, I did the relief "circle plunges" on one and nothing on another. When I dissected them both open this morning, I had zero air pockets in either of them. I poured at 200 and am using aluminum molds- I heated 2 and didnt heat the other 2, both came out with gorgeous crystal patterns. The leftover wax in my glass pouring pot even has a great pattern I have to say I am extremely pleased with this wax and at a great price as well! I would definitely recommend.