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The LOW 10-15 psi recommendation is For spraying water based paints like Acrylics, which will begin drying on a micro-scopic level internally in your gun with Higher air pressures due to the increased heat associated with those pressures.
Like a quick dry concrete it will finish drying mid-air and bounce off the surface you intend on painting, creating a very "thin" ghost like coverage.
As you continue spraying , like Cloggin artieries it will accumlate inside your gun eventually cloggin it just prior to which your gun will start spitting and stop sparying perhaps even blowing back up through the paint cup.
But if you only spray enamels you can get away with out teh ability to vary the out put pressure.
Yours MIke
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"Art is never finished, only abandoned." Leonardo Da Vinci
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