Does ambient temp and the amount mixed affect the pot life?. I mixed 100 grams catalysed at 1.5% by weight and it went off in the pot in about 5 minutes.

Certainly does! Dramatically. Every 5 degrees halves your pot life. 

Hi Hanaldo, The uni mould guide does not give any temp range or pot life only a cure temp, what is the temp range to mix and apply the gel coat and how long should the pot life be ???