These cans are new old stock that have been stored indoors in their original boxes for several years. I would not hesitate to use this Varathane, but it's up to you to decide whether it will be suitable for your project before you buy it, as the sale will be final (no returns). If you research how to tell whether Varathane is still good, you should find that as long as the liquid hasn't gelled, separated, or developed an odor, it's still good. For example, if you Google the following, with the quotation marks, you'll find an article from Family Handyman that says, "Then try brushing it on scrap wood. If it goes on fine, use it." The Family Handyman article refers to polyurethane in much worse condition, that has skimmed over or developed crud, neither of which has happened to the stock I am selling. I opened one can to check, and it was perfectly liquid. I've sold six cans on eBay and have positive feedback from the satisfied buyers of those cans that I can send you screenshots of to read. I also tested a brushful on a small piece of wood I can show you; it dried hard and clear exactly as it should. The cans are all from the same production batch.