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70C is the temperature where the resin begins to flow. If you skip through this stage too quickly then the resin won't have enough time to flow meaning you can get issues with pin holes. A dwell at 70C for a minimum of an hour is recommended when you are looking at higher temperature curing.
As hanaldo suggests, 1C a minute is about right and that depends on size of the mould, how good your oven is etc. You may find for larger pieces you need to slow it down to allow the mould to catch up where as smaller moulds will heat up quickly. As such you may need to vary your cure cycle a bit to get perfect results.
If you have time, generally longer and lower temperatures are better as issues like mould size, oven heating rate etc don't tend to be so much of an issue as the resin is curing at the optimum flow temperature anyway. A lot of people will tend to cure at 70 or 80 degrees throughout but you do really want a good 10 hours to be sure its fully cured.
Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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