I painted the interior of a 1964 Chevy Pickup. Sanded it very well, primed it, sanded and primed more. When i sprayed it, it looked really good. Now, several weeks later, it’s a little chalky. Still looks good, has lots of gloss, but when you rub it the gloss will come off. I’ve sanded it back down but wanted to know if there was something that I did or didn’t do before I respray it.