It's never a good idea to use old nail polish. It can get goopy and gloppy and gross once it gets old. So what is the best way to store your nail polish so that it lasts longer? Nail polish actually keeps much better if you store it in the refridgerator. Keeping it at a cool temp is the best way to keep it from getting goopy. So if you live in a hot climate, keep it in the fridge and see how much longer it will last.