Oops I left my MAS epoxy and hardener (2:1) outside for about 4 months in the California weather, sun, ash rains after the fires again and again, etcetera. They were covered by a tarp thankfully. The can with hardener has shrunk some, I estimate about 10%. It was never opened. Any idea what has vaporized? I think I will keep using it anyway at a slightly changed ratio regardless since I like to learn the hard way. Unless anybody convinces me I should not.

Thanks for any advice,

Henk

PS I also found that plastic cans with System III hardener and resin can cave in over time. I hate to dispose of toxic chemicals, curious what causes this and how bad it is to keep using it.