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Peak exotherm is important because you want to avoid a run away if you're doing a thick laminate. Building too much thickness in one hit can cause the heat build up to get so hot that you get uncontrollable shrinkage, potential cracking, and possibly damage the mould if it cant take the temperature.
Honestly, 10 layers of a 300g uni is not really that thick, so this shouldn't be too big a worry for you. But using a slower resin system with a low exotherm is a good idea regardless. By all means, apply heat AFTER the exotherm has died down again.
For me personally, with the resin systems I use - 15 layers in one hit is no issue. However it may be an issue with your materials and equipment, so I would always recommend doing a smallish test first.
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