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you could put the pot into ice but that will only cool the outside volume of resin. The problem with resin in large quantities in a typical pot is that the heat produced as it begins to cure rapidly builds up into a chain reaction and the whole pot will end up really hot, smoking and as a block of solid resin.
You can use a hardener with a longer pot life as one solution but it only delays the inevitable. Its having such a large mass in one pot that helps cause the rapid reaction. if it was say in a bigger bucket spread out over a larger area, the heat would dissipate, however that usually isnt practical for infusion.
You are probably better off just mixing it in batches. eg max 1kg batch. start the infusion with 1kg (throttled if need be on the line clamp) and while its starting to infuse, mix another batch. You should have enough time while it infuses to mix a batch and let it stand for 5-10 minutes to degas. If youve got a degas chamber then your turn around time will be even quicker.
If you still have issues, knock it down to half kilo batches after the initial kilo. The infusion will naturally slow right down anyway so the resin uptake shouldnt be too fast for you to keep up.
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