Most likely you have a multitude of problems. If you shot it with a gun, the paint wasn't thinned enough and you should have used "hardener" with it. The hardener would slow down the drying time and let the paint flow. If it was humid, and if you have "blush", you can wet sand with 1000 and try buffing it, or wet sand it with 600 and reshoot it. If you used rattlecans to paint it, most likely it went on dry due to the heat.