Re: power how long will it keep?
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As long as you keep it dry and it dont get too hot or cold...
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I have powder that is over 40 years old (price on the can is $1.15), and it has been stored in the garage attic - over 120 in the summer and -10 in the winter, and it's fine.
It's hard to damage it if you keep it in the orginal container (or equivelent), and keep it dry.
I have only lost one can of powder, and that was a 1# can of 4064 that decomposed from poor washing during manufacturing.
Here, kitty kitty kitty.
LRH member #23