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Old Sep 17, 2011, 01:55 AM
bjaffee is online now
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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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Old Sep 17, 2011, 10:49 AM
slopeiron is offline
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I'd say if it kicks your good to go. The West Systems hardener turns dark over time too. But it still works just fine. Just makes brown parts.
Old Sep 17, 2011, 11:29 AM
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Your test will tell. Sometimes old epoxy doesn't cure and it stays gummy or tacky even though it has set up to a firm state.

My thoughts, ... if in doubt and it's a small quantity, ... replace it, ... if it's a gallon, ... pray.
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Old Sep 17, 2011, 04:44 PM
jimbo320 is offline
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Good quality epoxy has good shelf life. Just test it and see. If it's good quality will be ok.
Old Sep 17, 2011, 05:01 PM
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Thanks guys. My test batch was rock solid by morning today, so I glassed the bottom of the wing root. So far, so good.

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