Firstly never use pumps as a measure, they soon get gumed up and do not dispense a true measure. In cold weather I keep resins etc in the airing cupboard, also means resin is at a better temp when you use it. Regards your current batch of resin try a sample on some scrap to see how it works. In cold weather I always use local heat to help it set.
Good luck
Dare Barry N3521 The Ginger Pudding
Good luck
Dare Barry N3521 The Ginger Pudding