I don't have any info on the actual shelf life, although I've used in lanterns after having it on hand for quite a while.
I'd recommend that you store it in the original unopened cans. If your'e concerned about rust, you can spray the cans with polyurethane, or paint with melted paraffin. That said, I have a couple of cans in storage that have been there for several years and don't have a problem with rust, yet.
Lee
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