I have a question about airbrushing. I just bought my first airbrush on saturday. It is a Testors, just to start out with because i want to test it out and i need to know a couple of things. 1. How far of a distance do i have to be from the rolling stock to airbrush it? 2. How would i get the best effect on the car, dirt, and rust? 3. How would i clean it up after i am done using the airbrush? I am a little confused at the moment and need some help.