1982 We have not changed the mixture in 10 years. Is it possible you have stored the epoxy differently? Matt

I've used this exact epoxy from the same store for 15+ years now. I don't use that much epoxy, but I hate the dual syringes that don't mix equal quantities for small amounts and I like the savings, so I have always bought the dual bottles since 1982 or so.

In the last 15 years, these bottles have lasted in the cabinet 2-3 years, unless I used them up in a year and a half.

Since 2011, not so, they have changed it so the hardener starts getting hard in a few months and is useless after 6 months. This is no accident that it has 1/3rd the shelf life it used to.

Planned obsolescence is what I get for my loyalty to Hobby People? Back to Tower Hobbies for their store brand (which is $3 cheaper anyway).