Looks like 15 years of Texas heat rendered this stuff unusable. The resin is like thick tree sap and brown yellow.
Ditto on the above. My epoxy work is small stuff (knife handles) in an open garage. I’m not concerned at all with organic vapors. Cleaning stuff with xylene or acetone, on the other hand, I use one. I wear one for all sanding whether it’s wood, antler, steel, or nasty carbon fiber. No dust is good for you. $25-35 will get you a good one. I like the 3M 3000 series. Easy to find filters for them.