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Epoxy in polyester molds sometimes can be a bit tacky. Even if both mold and part are cured properly. But the really good release agents, like easylease (i guess, never used it) should should still be fine. I had some issues with standard wax, then used a chemical release agent (from hp-textiles, wich seems to be differnt to easylease, aß it is water based, but not like pva) als never had Problems again. I once read, that this is caused by a light porousity of up resin combined with the excellent bonding propertys of ep resin. So pva should solve the problem, too.
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