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Old 04-07-2015, 09:59 AM   #1
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old epoxy warning

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I had some old epoxy, that went bad real early in it's life and I heated it to make it pour again (the 30 min. stuff). I then used it to glue on a vertical stab, which took about 10 minutes to line up. After about 3 hours I removed all the forms and it was good to go. I was putting stuff away and I bumped it, there was a snap and it fell off, the glue dried as if it crystalized and I was very careful to mix it properly. Today I sanded it off and it still seemed to be crystalized, not a epoxy cure. So I suggest a warning using old glue. What if it broke in flight?
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Old 04-07-2015, 11:16 AM   #2
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Re: old epoxy warning

Good to know - what brand of epoxy was it, I have some SIG that did that once. I did heat it up, and it seemed to have glued well.... I hope I don't find out to the contrary.

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Old 04-07-2015, 12:24 PM   #3
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Re: old epoxy warning

Yes, it would be interesting to know the brand.... there have been "bad lots" and probably some long shelved epoxies don't respond to warm water "revitalization".

What was the brand .... and how did you warm up the epoxy.

I recall that once I utilized some thickened epoxy, relied on hot air gun to warm up the mixed epoxy and got the "crystallized"/failed glue joint you experienced.

On the other hand I have several packages of 20 year plus Hobbypoxy 2, a 45 minute working time epoxy and a very high quality U.S. manufactured product that long ago stopped being produced. The epoxy in the unopened tubes have the same viscosity as when first bought. The epoxy in some opened tubes had thickened and when properly warmed in hot water, test glue ups have been perfect.

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Old 04-08-2015, 09:40 AM   #4
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Re: old epoxy warning

The epoxy was Mercury Adhesives 30 minute. To warm it I used hot water from the tap into a container which held the epoxy, they were held down with weights, the whole warming up was from 30 to 45 minutes using a trickle to keep the water from cooling down and maybe 115 degrees F. You could handle them and it was warmer than body temp but not uncomfortable.
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Old 04-08-2015, 09:59 AM   #5
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Re: old epoxy warning

I have not had any of that kind of problem with old glue.

But I do tend to use a heat gun to warm the glue after I mix it to give it a better ability to mix, as well as better penetration when applied to wood. And it cures faster when it was heated. Just be careful with 5 min epoxy, you have to work REALLY FAST. It tends to set up in less than 3 minutes..LOL
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