I have a fair amount of the epoxy/resin/ hardener (with the epoxy pumps still in the them) left over. How do I store them? Do I need to remove the pumps and will they ,they pumps, need to be replaced if i do remove them? How long will these products (resin and hardener) last? I'd like to use them for my next boat building project which might be 6-12 months from now. Thanks as usual!