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I talked to Alliant powders. They told me that if the plating inside the old cans is has rust spots, the powder is doing that, and the powder should be dumped.
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Interesting. I have several partial cans from the 60's. The metal cans do have rust inside (light surface rust). But the powder still has the solvent smell, has no red dust on it when checked on white paper, and seems to perform just like any other. It has always been stored properly. I continue to use it.
So I claim to never had any go bad.
I suspect the rust is more of the normal expected life for the tinning on the steel can of that age.