rageofreason [2008-07-13 09:02:56 +0000 UTC]
Thin lines in airbrushing are done by working with very low airpressure (just enough to drive the mixture out), working very close to the surface (almost touching it with the needle tip. Some airbrushes like the Iwata's allow you to remove the air cap, which bares the needle tip; remove it to come closer to the surface. Finally use very diluted paints (mix ratios: 1 : 10 or higher). I never start spraying immediately on the surface, but always test it on a small piece of paper that I hold between the airbrush that is already close to the surface. I fiddle with the trigger to find the proper consistency of the spray and after it is stabilized I quickly remove the paper and move the brush closer to the surface yet and start spraying on the surface. This may sound complicated, but it will become second nature soon and all this takes place in a few seconds only. Work in layers, which allows you to apply all subtleties required.
Applying thin lines in a single pass is done by moving the airbrush over the surface fast with higher air pressure and less diluted paint. This technique is often used to spray hair. It requires good trigger control in order to not let the lines begin and end abruptly and a steady hand. Hope this helps.
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