When I started airbrushing (3 years ago approx) I had all kinds of trouble with orange peel. After a lot of trouble (especially lacquers like nail polish), it was noticed that the problem was worst during warm days. The lacquer would go on much better during cold days, as it would dry slower and flow easier. This led me to do some research, and found that the you could buy some lacquer thinner with a retarder mixed in (or seperate if wanted). A good example is Mr Levelling thinner. Once using this stuff, I have had minimal problems spraying lacquers. On hot days, I even mix some with the decanted tamiya spray paint. It is like magic!!! Most cars I build now, I don't really sand the base coat unless I have dust stuck to the surface. Once done, its just a matter of doing two coats of 2k clear and the finish is like a mirror. Once again 2k clear flows really well and drys very slowly, making it easy to achieve a mirror finish. Just as a note, I don't enter contests etc, but am very satisfied with the finish using these techniques. Hope this helps Mike