In a dual action airbrush the trigger controls both the air flow and the paint flow. Beginners should really take the time to practice on how the trigger works so that they can perfect their ability to airbrush. Your airbrush will have a back lever as well that acts to shut off the air flow and paint flow when the trigger is released. When doing airbrush art there are different types of airbrushes that are available. The best airbrush to use for putting airbrush art onto an automobile is a gravity fed airbrush. This is the one that professionals use and will give your artwork a high quality look. The paint can be automotive paint but make sure that you use a well ventilated area as the fumes can pose a health hazard. Real tattoos come with pain and is one of the reason that some people do not get them. So using airbrush art to create a tattoo gives people the chance to have realistic tattoos without the pain. Real tattoos are permanent and you are stuck with what ever you get. The only way to remove a tattoo that you do not like is to either do a cover up tattoo or go and have laser surgery to remove the tattoo. Another great way if you are doing this at home is to allow the design to dry then turn the shirt inside out and throw it into the dryer for about 40 to 45 minutes on the highest heat setting. After this your design will hold up to laundering. If you use a paint that does not require heat setting then you should still set the design. With single action only the air is controlled with the trigger. The trigger will control the air and the amount of paint that comes out is determined by the needle adjustment on the back of the airbrush handle. Dual action is when the trigger on the airbrush controls both the air and paint. The trigger is pressed down for the air and back for the paint. There are some great videos on the market that will show a beginner how to do airbrush art. These videos are created by expert airbrush artists that will show you exactly what you need to know. Air Brush Action offers up a good beginner's video called AirBrush Action Introduction to Airbrush. This video comes on DVD and will help you to learn about airbrush art.