Don't wet-sand between coats! 3 coats is usually enough, if all is covered well. Don't let it cure between coats either, you want to spray the next coat when the previous coat is barely tacky, or barely not tacky. THEN wet sand it if needed and buff. It is apparent you don't have much knowledge about this. I'm not trying to be mean, but I think you should purchase a book about basic body work and painting before you start this project.
