What is the difference between the classic double action airbrushes and the automatic double action airbrushes?
A. Classic double action: (Focus, Infinity) you have to push trigger down to get air, then pull backwards for paint. With the fixed (automatic) double-action you pull the trigger backwards, and first air – then paint will flow. This is popular on many German- made airbrushes. (Grafo, Colani, Hansa models).