i also didnt realize it was that hot when you painted. that explains a lot. as to what to do now, i'd strip it and start over, but, you could try and d/a it down with 220, then wet sand it, and re-shoot it. you are gonna go thru a lot of paper as it is going to be soft. you will need cooler temps to shoot at. 80 degrees would be good, keep the tractor out of direct sunlight so the metal doesnt heat up. not sure how you are applying the product. but for the alkyds and synthetic enamels, i shoot a light first coat (tack coat) just enough to get color, not complete coverage, then let it flash off. second coat is a medium coat to get uniform coverage, let it flash, then the last coat is a wet coat to get gloss. you do need to be careful as the last coat gets a tendancy to run and sag if its too heavy. here are a couple pics of my cub i did in farm and fleet paint about 15 years ago, no hardener. its a working tractor and still looks pretty good considering all the use. i was not going to shoot expensive paint on this tractor.