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. The internal mix is when the air and the paint both mix inside of the airbrush. This will create a atomized fine dot spray pattern. This makes the internal mix a good choice for fine detailed work in your airbrush art. The point at which they come together is in the head assembly. The external mix is where the air and paint come together outside of the head assembly or the fluid assembly. 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. You should not have to take your airbrush apart every night to clean it, it is alright to only do a complete break down and cleaning once a month. Just make sure you do not go any longer than that. When you take it apart to clean soak it in a commercial grade cleaner overnight. The next morning take an airbrush cleaning brush to it. Your airbrush will have a handle on which you can hold onto the airbrush with. Airbrush models come with either a solid handle or a handle with an opening. The purpose of this opening is so that you can adjust the needle without removing the handle in a single action airbrush. Most experienced airbrush artists will actually take their handle off so that they can deal with clogging issues without delay. Tattoos that are done with airbrush art look realistic compared to other temporary tattoos. Henna as temporary body art does last for awhile requiring time and lots of exposure to water to fade and disappear. Henna though takes a long time to hand paint onto the body. The bigger the artwork the longer it will take the artist to pain the henna design on.