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Hi, I am having problems with some plaster slip- casting molds that I use regularly. I made the molds in March this year and suspect I have cast into each around 30 times. Over the summer they have sat unused for two months in a dry cupboard. I have gone back to use them and I'm finding the casts are now more reluctant to pop out. They seem to be sort of sucked in there and the plaster doesn't want to release the cast. They are five part molds and sometimes just one side seems to stick on, as if it can't take the moisture out of the slip - even if the rest of the cast is relatively dry. The casts will come out in the end but they are taking longer than before and I risk ripping the casts when removing them. Does a mold have an expiry date? Could there be anything I could treat them with? Please help! Thanks, Elle