If the automotive paint that you have chosen does not flow then thin it down so that it flows. The paint should be thinned to about a milk thickness. A good automotive lacquer will work fine to thin down your automotive paint. Different airbrush art calls for different psi on your compressor. PSI stands for pounds per square inch and for automotive airbrush art you need a compressor that has a psi of 55-65. Professional Airbrush Techniques by Vince Goodeve will teach you some pretty intricate designs. This book will help you learn how to prepare metal surfaces so that you can begin to learn or advance with airbrush art on motorcycles and cars. While the book will teach you some intricate designs do not worry though cause the book, also has some simple projects that you can start with when working with airbrushing motorcycles and cars. If you are doing a stencil for say a dog then you would want to take your time and make sure that the eyes were the same size, the nostrils were cut out shaped the way they should be and so on. If you rush you could end up messing your stencil all up. The stencil is to aid you in creating your airbrush art and is a big part of the art process. Start looking at various images and keep surfing until you find the one that gets your creative juices flowing again. Print the picture that help you so that you can keep it around as your muse for as long as you need it. It may take awhile but with the limitless supply of images and artwork on the internet it is sure to keep you supplied with some inspiration. Soon airbrushing would be used to paint Pin-Up girls on to the American planes during WWII. This is where airbrushing started showing up in the more modern world in the form of art. In the 1940 Walt Disney would show the world a new use for airbrush art. Walt Disney would take airbrush art to the animated screen. How To Prepare Various Surfaces For Airbrush Art When you begin an airbrush art project, you will first need to prep the surface. The prep work that you do will be determined by what type of surface you will be airbrushing. The prep work to the surface will ensure that the paint sticks to the surface and that nothing is interfering with the airbrushed design.