To add to this thread, I too started with Donn's DVD, also with great results. My only regret is that I didn't get the Paasche airbrush sooner. His process also laid the foundation for trying other things and having a baseline for judging the results and what works. Just today, my son and I tried some urethane clear over the enamel, which also worked great.
Donn's willingness to answer questions was also much appreciated!
-Art