Pot life (refresher) is the term given for the allowable time to manipulate your resin. It starts from the second you combine the 2 compounds. Pot Life varies from resin to resin. Please refer to your specific products for actual Pot Life times.
15 seconds is a long time when referring to Pot Life. And it still goes just as fast. So you need to be organized and efficient. No wasted movements.
One way to gain yourself a bit of extra Pot Life time...
Smooth On products, the way the instructions are read, you might think to add "A" to "B". But you don't have to. It doesn't matter if A gets poured into B or the other way around. And this can be applied to the silicone for making the molds as well.
POUR THE THINNER OF THE 2 COMPOUNDS INTO THE THICKER ONE. You waste time trying to get every drop from the thicker compound into the mix.
And no...it doesn't matter if you stir clockwise or counter clockwise. Just mix well. Always. That's where most of peoples problems happen. Insufficient mixing due to panick over pot life and pouring everything before the resin/silicone starts to cure. ever over extend yourself by trying to get too much done. One bumped mold can throw your timing right out the window.