The flash time thing may have been the problem. I started waiting the recommended 15 minutes between coats. But one day I was talking to the guy in the paint shop and he said to spray a layer on a scrap piece before each coat and use your finger to test if it's ready for another. Basically he said when it sticks and makes little strings between your finger and the piece then it is good. that is what I started doing. The thing is, it would get like that long before 15 minutes. He told me if it got to the point where nothing stuck to your finger then it was too dry. I suppose maybe I should have been waiting longer.