I pulled a Super Flex socket over an old mold and it stuck to the mold. What caused that?
Your mold had probably gotten too dry. When pulling Super Flex over an old mold you can insure that this doesn’t happen by placing a wet towel over the mold for a while so that it can absorb the moisture, or dip the mold into a bucket of water until the plaster is re-hydrated. (You should never pull any flexible material over a dry mold.