Another to think about is not to mix too large a batch of resin at a time and not to mix it in too small of a container. Each of these can cause the resin to start curing too soon. If your resin mix was getting hot in container then that was probably why it only gave an 8 minute working time. Guess how I know about that. Actually almost started a fire once by mixing too much resin on a hot day. Just took a few minutes and the resin was smoking.
JJ
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