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i went down the road of polyester moulds on my first attempt, didn't take too much notice on the temps as it was curing having laid up the gelcoat then 3 layers of csm, as it was done at work after hours and i was home while it was curing lol, i did notice though that after the last 3 layers were added and cured it had shrunk a little, probably not too much to worry about but it bothered me so next was epoxy.
no gelcoat i could find in epoxy so it was resin and calcium carbonate to make the gelcoat, i love epoxy its great! but don't do what i did and add the 'thickener' after the activator as its goes off soon after its mixed lol (its all learning) so next was epoxy again with talc, same effect as calcium carbonate (its probably the same stuff!) weigh off the resin mix add in the talc to desired thickness then add required activator, worked great
i found i could lay up the gelcoat add a light second coat when ready then add the woven cloth (no csm) and just mix up resin when the last lot was tacky and add more, layer after layer
a little tip with epoxy, don't rub your nose when you have a little on your hand! it really burns on the inside off your nose... trust me lol
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