I have been doing some customs lately and have been having a hard time getting the finish right on the paint. I have been using testors metal flake and krylon spray paint. I prime them and then do a few coats and wet sand with 600 grit in between coats but still end up with rather dull finish that us not anywhere near factory quality. I seem to have a big problem with orange peel. Can anybody give me direction on how to achieve a better shine? Do I need to be using an airbrush? Any help would greatly appreciated. Thanks!