PVA = Polyvinyl Alcohol is a release agent.
Use it after waxing the mold and letting the wax gas-off for about an hour. The PVA is water soluble so easy to clean up.
Check with any fiberglass supply place and they'll have it.
Cheap insurance to ensure a part or mold does not "stick"
Hate it when that happens. I just now finished spraying PVA on a new roof duct mold for an RCR Superlite Coupe. (USA). I have the only mold for that part and the manufacturer gave permission to make them for customers should they desire it. Been playing with fiberglass since the early 1960's. Simply a retired old broke guy having fun!
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