...Well, it won't fix it, but it does help quite a bit it reducing evaporation. I've been using these for a few years now and I bought them mainly to protect my better Zippos from wear and damage. In using them I discovered fuel evaporation was significantly reduced. I recently pulled one out of the bag that had been only partially fueled and after a week in the bag it still had plenty of lights left. You can get them on Amazon, 1.5" X 2" ziplock bags, $8 for 1,000 bags.