I am making 1/24 scale model car windshields from .030 PETG and I am having problems getting a very clear, distortion free part. The mold is wood covered with thin sheet metal that is highly polished. I preheat the metal mold form before each pull, but the part always has a pattern that looks like the plastic is sticking and spoiling the clarity of the little windshield. Can I use a mold release? Will this help?