well, I was painting my shoulder armor with the tractor spray paint. It wrinkled bad on thone of the pieces, on the second coat. I guess it must not have been dry, but I let the first coat dry for about 15 hours, it was not tacky at all. I guess let this dry, and scuff it up with fine grain sander, and try it again? but wierd that it would do this. I guess I will have to wait a couple of days between coats?