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Measure the amount of catalyst you put in very carefully and adjust it according to experience. I have access to disposable syringes and a 5 ml one is excellent, as 4% is the default amount, but I've varied it between 2 and 6%, according to the weather mainly (temperature). 4mls in 100mls resin, and I rarely mix more than that, even for a big job, as that's about the amount I can use before it starts to go off.
John
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