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The epoxy I discarded many years ago was Shell DPL-862 (I think) with the
TETA hardener.  I might have been tempted to toss that stuff away regardless,
due to the reduced hazards of Jeffco.

The original question was where out-of-date epoxy and hardener could be
safely used.  I would opt for micro only.  After all, every epoxy joint is
holding **something** together, and I don't want any of those joints to fail.
 If the armrest pops off I'm probably going to survive, but I guarantee you
that my passenger would never fly in that airplane again!  ("That's the same
stuff holding your WINGS together!!!")  I already get enough grief about
"those two little bolts holding the wings on" from people who don't
understand that these are the biggest aircraft bolts I've ever seen in a
light aircraft.  It would be hard to explain away a bunch of cracked epoxy
joints with "Oh, that's only secondary structure.  Don't worry about it."

I find that I use up an entire gallon of epoxy in a slow building year, and
more when I'm really cranking.  So I'm rarely tossing out expired epoxy,
although it has happened on occasion.  Discarding out-of-date stuff is
therefore not a significant expense for me.  I write the date I received it
on the bottle with a Sharpie marker so I don't forget.

I guess I need to close my tail this summer.  My hysol will be expiring in
October.  Now THAT stuff is expensive to replace!

- Rob Wolf
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