Is old epoxy okay to use?
Got some 20 minute Finish Cure that's been sitting around for a long while. The hardener has turned a VERY dark yellowish brown. I've got a test batch setting up right now...assuming it cures okay, is it okay to use? I just want to make sure it doesn't set up more brittle when it gets old.
PS...I'm using it to glass the center section of a wing.
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