woah, don't think I understand most of that, but interesting. The ingrediant that catches my attention is the hardener with most of the ingredients being some kind of isocyanate in the name. Bad stuff menard. Now stuff like resin and mek and acetate I can understand, but all the complex chemical names I don't but they are probably a combination of chemicals. It was always my understanding that the most durable were polyurethanes, but don't know now that I read what powderbill wrote. But the clears labeled polyurethane say to buff within a certain time period in some tech sheets. The urethane clears I haven't seen say this. Seen powder bills occupation was a chemist. Who woulda thunk it.
I often see a lot of similar chemicals in the hardeners for urethane primers as the clear. One time I had a small part I had to clear and was out of hardener for the clear. Used some primer hardener so I didn't have to go spring for the hardener for the clear. I mixed a little up and let it sit overnight and the next day it was hardened up, so I used the primer hardener. Didn't see if there were any long term effects though.