Airless sprayers work by pumping out paint from a small tip on a spray gun. There are no air compressors, nor is air involved in any way to move the paint. Airless sprayers are very efficient and will apply paint very quickly over a large area. If you are using an airless sprayer to paint your car, there are a few things to keep in mind.
Cover all areas of your car that are not to be painted. An airless sprayer is not as easy to control as a brush, so do not take any chances that you may accidently spray a mirror or glass. When spraying, the airless sprayer paint will create a cloud of paint that will settle. Wear a protective covering.
Keep the spray gun aimed at the area that you want to paint. Never point it towards yourself. Move your hand in a horizontal motion while spraying. Do not stop to spray as you will create a heavy concentration of paint in one area.
Begin moving your hand from side to side. Once you have a steady motion, begin to pull the trigger.
Release the trigger before stopping motion of your hands when you are ready to quit painting.
Clean the sprayer so that no paint builds up and dries up inside.
Do not mix oil-based and latex-based paints in the spray. Never mix a paint thinner with a latex paint. Sprayers operate at high pressure, do not spray yourself or any one around you as this may cause injury.