+x Andy Ricketts - 8/11/2020 3:07:52 PM+x Warren (Staff) - 7/16/2020 1:26:21 PMIt sounds like the paint has outgassed through an uneven layer of PVA. PVA is normally ok as it provides a barrier. However if the PVA isn't quite even then that could cause issues. Also sometimes if the resin is a little green it grips the mould harder so would likely rip off a weakly attached paint - polystyrene doesn't offer the best bond. We tend to recommend avoiding using paint on moulds or patterns for that reason.I would imagine once those parts are fully cured, the paint will wipe off with acetone. .....But if the mould IS painted with a fully cured cellulose paint, what release agent should be used? The recommendation in the videos is to only use one layer of a PVA release agent, additional layers just move the previous layer to no advantage and that clearly does not give the required release result. So, what release agent should I be using?Currently I have wrecked moulds, made of several styrene parts, glued together and with styrene filler, all sanded smooth...I can repair them and return them to the original state (with or without paint) what is my recommended course of action? And then, what release agent to use?
+x Warren (Staff) - 7/16/2020 1:26:21 PMIt sounds like the paint has outgassed through an uneven layer of PVA. PVA is normally ok as it provides a barrier. However if the PVA isn't quite even then that could cause issues. Also sometimes if the resin is a little green it grips the mould harder so would likely rip off a weakly attached paint - polystyrene doesn't offer the best bond. We tend to recommend avoiding using paint on moulds or patterns for that reason.I would imagine once those parts are fully cured, the paint will wipe off with acetone.