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Group: Forum Members
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I'm a proper tight ass! If its of use I just use regular glass to make moulds. I double gel and lay it up a layer at a time waiting for it to cure between each layer (well, tack off). My thought with this is that it is managing the exotherm that is key. Regular resin will get hot if cured in a thick laminate, cure and then shrink as it cools. The tooling resin doesn't do this. By keeping it cool during the cure (by laying up a layer at a time) you dont get the shrink. I have moulds that I made years ago where the original plug still drops in. These have been fairly large moulds too.
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