Originally Posted by
baudot
I've been given a mold to vacuum form off of that the mold-maker covered in spray paint. The spray paint melts at vacuum former temperatures, glueing itself to the styrene I'm molding atop it. Freeing the mold up from the styrene wrecks the styrene.
I've gotten some mileage out of the bubba-answer of just spraying the mold down with Pam High Temperature Grilling Formula. Yee haw. But the paint still melts through that and gets stuck to the styrene. (Less and less with each job, as there's less of it left.)
I'd love to hear the real way to redeem a bad mold that gets stuck to the thermoplastic.