PSI stands for pounds per square inch and for automotive airbrush art you need a compressor that has a psi of 55-65. Iwata is a great name brand to go with and they offer four compressors that will work for airbrushing automotives. Badger is another good name brand that you can go with. They offer several air compressors that will work when doing airbrush art on automobiles. Inspiration can also come from books as well. Go to the library and check out some art books to help you get some inspiration to get you going again with your creative design. Sometimes by looking at other people's works you can get past your creative block and start creating your own airbrush art again. Magazines such as Hot Rod, Airbrush Action, AutoGraphics, Easy Rider, Mini-Truckin have featured Shanteau's airbrush art in their publications. These of course are just the tip of the iceberg when it comes to publications that have featured her work. Shanteau does not just create brilliant airbrush art, she also teaches others how to create the same high quality airbrush art that she herself creates. The less air pressure means that you can use slower movements when airbrushing. The bottom feed is where the cup is mounted to the bottom of the airbrush and the paint is brought up via a siphon tube. It is for this reason that the bottom feed is also referred to as a siphon feed. Since the artist can attach the cup to the bottom of the airbrush the colors can be changed quickly by using different cups prefilled with the colors needed. You can go with a nice mural on your wall to give a room in your home an artsy feeling. Or you can scale it down and just airbrush a border at the tops of the walls. Airbrushed borders look more decorative than glued on paper borders on your walls. Thus the interior of your home can be your canvas for your airbrush art. Usually this will be sold as airbrush body paint or airbrush temporary tattoo ink. These are the only types of airbrush paints that are safe to use on the human skin. These paints will have a hard time staying on skin that is oily. A tattoo artist will rub alcohol on a person's skin to kill clean and kill germs prior to beginning to start a tattoo.