k... so everything was going well until it started raining. my project is in the garage so it doesn't actually get rained on, but the last coat i put on after it started raining will not harden all the way, its hard to the touch and dry enough to wetsand, but when i pull my fingernail across it, it digs in really deep. Its had almost three days to harden yet still scratches easily. before it started raining out here the paint was hardening to scratch resistance in about 24 hrs. I'm pretty sure this stuff doesn't like humidity. well.... now i'll probably strip back to the primer with the DA sander and start all over.