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Should be ok. I've used paint that old with no problems. The main thing I can think of is that it may have lost propellent if it had a defective valve, then the paint might come out in sputters & big drops. I'd suggest shaking it a lot! Like maybe two minutes up & down, a minute rolling the ball around the base inside the can, and then maybe another minute shaking, before using it the first time. You want to get the settled pigment mixed in well, so you're not just spraying thinner. Then of course, try it on some scrap, before you spray that model you've got 40 hours worth of custom work into.