RE: Epoxy gone bad?
I went to use some 30 minute epoxy once but it was taking forever to flow down the bottle. I microwaved both bottles for about 10 seconds and that helped the flow. I used the epoxy to mount my FourStar 40 landing gear.
Although this is not a scientific test and I have not tried pulling on the gear, it's been about a year I have had many landings (some a lot rougher than others) and gear are fine.