Fiberglass Molding

Hello Guys! So, I'm very interested in learning to make animatronic creatures, and I know that the under-skull in most animatronic creations is made from fiberglass. Right now I'm already familiar with the process of making negative molds out of plaster of Paris, and I also know how to use polyester resin. However, I've never actually used fiberglass to cast an object from a mold.
I guess what I'm actually asking is what kind of release agent should I use in casting fiberglass with a plaster mold?

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