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PVA is a good barrier release agent for issues like this with "green" moulds. The styrene can still cause problems with waxs and chemical release agents.
It is common practice with traditional moulds made in polyester to either wait for the mould to season a little, or use PVA for the first few pulls to get around any issues with styrene still being present.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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