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Hi Joe,
As usual, you're right on all this.
When working with the putty system (epoxy tooling gel coat and epoxy mould making putty) I wouldn't use acetone to bring a 'cured too far' gelcoat back to life, instead I would apply another coat of gelcoat or even a coat of laminating epoxy and then put the putty onto that whilst it was still completely wet. We've done this to good effect. The best thing is to catch it at the right time but if it goes too far (and you're using the putty) then the worst thing you can do is try to stick the putty onto a dry gelcoat. Instead, wet it with laminating resin or another coat of gelcoat and then put the putty straight onto that.
When working with Uni-Mould It's definately better suited to large moulds than the putty system (mentioned above) and it's more cost effective too. I think it is harder to get wrong and because it uses a coupling layer that is reinforced with a light glass then your chances of ending up with air voids between the gel and the reinforcement are a lot lower than they are with traditional GRP.
Uni-Mould smells! - You certainly cannot do this in your house or you will be incredibly unpopular.
Matt Statham Easy Composites / Carbon Mods - Technical Sales
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