On Mar 2, 11:50*am, Frogwatch wrote:
I had some epoxy left over from a project two years ago and I tried to
use it. *It seemed to have separated into a watery top part and a
thicker milky bottom part. *The whole mess smelled like ammonia.
Nevertheless, I did use some of it by mixing it very well. *It took a
long time to cure but it did work. *A couple of weeks later, it had
gotten so that I could not even mix it so I had to throw it away. *I
am wondering if moisture had condensed as water in the container
somehow but this would be a lot of water, almost a half gallon.

I believe the resin itself has a long shelf life. But the shelf life
of the hardener is very short. If I found some left over old epoxy, I
would throw away the hardener, but kept the resin, and tried a test
batch to see if it cured similar to the way of fresh resin.

Jay Chan