Are you having problems with your resin curing way too fast? Is your resin curing before you can even pour it out of the cup? It's our summer heat. Try cooling down the catalyst by sticking it in the freezer for a minute or two. Still not enough stick the resin side in the fridge for a minute. Remember not to cool it down too much, optimum for most resins is about 70 degrees.
This holds true for silicones as well.