How do you get a mold to release?

I received these two molds as a gift a few years ago. They've been out in the garage but Buttoneer motivated me so I'm going to try my hand at this next Monday. What I can't seem to find information on is what to spray or lube the molds with to get them to release after the tufa sets?

Here are the molds from the garage-

Thumbnail by Equilibrium
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