I’m in the process of burning up some 2400 that a friend gave me. It was unopened in those metal containers I haven’t seen since the sixties, and it still works as good as it always did. The cans don’t have any real rust or other signs of neglect other than faded paint, so I think it was stored pretty well. If you call parked on a shelf in an Arizona garage as being stored well. I think as long as powder doesn’t show any of the classic signs of deterioration it’s good to go.
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