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I've noticed some wax lasts forever, usually paste wax. While the newer synthetic waxes have a shelf life of a few years depending on how they are stored. I opened up a bottle of 6 year old wax just last weekend that had completely separated and turned to a straight liquid that was very gritty. It was not usable. You'll be able to tell once you put it on an applicator. If you're unsure, just buy some new stuff. Wax is not that expensive.
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