Through an error in the processing of my pool kit order last summer, I now have two new-in-box but one-year-old vinyl liners for my pool. For the past year they have been stored in their boxes in an unheated (and uncooled) barn. I am not sure how vinyl ages in these conditions -- hopefully I will have no age-related problems with the one I'll be installing in the next few weeks. But what about the second one? It would be nice to have a spare on hand, and I may be able to find a better place to store it if it would increase its "shelf life". Any ideas or comments? Any experiences installing an "old" liner?