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The Epolite resin lasts a long time -- probably several years, maybe more.

The hardner is "good" for only about 6 months or so, in my opinion. You can
tell when it's time to change it out because it starts to get dark in
color. This is subjective, I know, but I chose to use only FRESH hardner on
any critical layups. I used the older stuff a little while longer for
non-structural things.

I am told that the shelf life can be extended by keeping the stuff
refrigerated.