These can be picked up rather cheaply from the store in the office supply section or hit the back to school supplies. You will need an exacto knife to cut your design out. Depending on the size of your stencil you can probably create more than one stencil from this plastic folder. If you purchase the see through folders then you can use these for stencils even if you are limited to tracing your design onto the plastic folder prior to cutting it into a stencil for your airbrush art. There are actually two reasons for the base coat. This base coat will help protect the nail from the paint and help the paint to adhere to the nail better. Metal should be wet sanded to give a rough grainy effect. This rough grainy effect will help the paint to adhere to the metal. With metal actually being smooth the paint will have a hard time sticking to the smooth surface. Imagine being able to create realistic eyes on a dragon you just airbrushed onto the hood of a small model car? When a person looks strongly at your artwork on the hood of the model car they can really see the capacity of the skills that you have as an airbrush artist. Or imagine that no matter what size your project is, even the fine details are brought out to the point that they demand to be noticed. If you do create your own stencils for airbrushing your automobile do not use paper to create your stencils. Automobiles need lots of paint and this will damage paper stencils rather quickly. So stick with plastic or vinyl material for your stencils. A great cheap plastic to use for stencils is thin plastic folders. Can the application of makeup with the use of an airbrush be art? Or is it still just the application of makeup that just happens to use an airbrush? When looking at what airbrushing does when used to apply makeup, a lot of people do believe that this is a form of airbrush art. When make up is airbrushed on the effects of what it does to the subject can be really drastic. 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.