So if you take some plastic wrap, fold it over a couple times, lay it over the can opening, put on the lid, and tamp it down the paint will last years and years in the can. Lost of moisture and air invading is what ruins stored paint. I've been doing this trick for a long time and have found stored paint is just like new when reopened for touch-ups. It also helps to keep the lid and the can rim clean before sealing it up again.
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