Once you are comfortable using the airbrush then you should work on creating shapes with your airbrush. Using a cheap surfaces airbrush circles, triangles, squares and rectangles. While this may seem stupid it will help you to learn how to create designs using your airbrush. Continue to practice with shapes until you are able to perfectly render airbrushed shapes. 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. Airbrush art also uses airbrushes with a side feed. The side feed has a cup that mounts on the side. Since the side feed can be rotated the artist can airbrush either horizontal or vertical. 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. Remember to do this gently so that you do not break your needle. The better care that you take of your airbrush the longer it will last. So keep your airbrush clean with the right cleaners and once a month do a full break down and cleaning. With needles most artist find that the airbrushes coming out of China bend easier than any of the other airbrushes. Airbrushing nails to airbrushing cars is explained in great detail to help you advance further no matter what surface you like to put your airbrush art on. Airbrush2: Concepts for the Advanced Artist by Radu Vero will help to teach the experienced artist more advanced techniques. By learning these advanced techniques the artist can start to create even more complex airbrush art. Micro airbrushing is needed to really capture the details of these small areas. Micro airbrushing is also a valuable skill for an airbrush artist if they airbrush small model cars. By acquiring the skills needed to do micro airbrushing the artist can capture more detail in their airbrush art on the model car.