I have a couple of inexpensive ($125) Astro Pneumatic spray guns. They both do a decent job (good enough that I probably will not be investing in a more expensive gun) but I would like to know how to get the most out of these. I have spent some time trying to fine tune them through the adjustments they provide: the fluid needle control knob, the fan width adjustment, and the air pressure control.
Fluid needle control knob: I read once that this should be adjusted so that a full trigger pull opens the needle as far as possible and to leave it there permanently. Is it always optimal to maximize the paint flow, or would there be instances when you want less coming out of the gun? In what instances would you want less paint flow?
Fan width adjustment: Do you want the widest fan width possible without a gap in between?
Air pressure: I know most products specify a certain pressure at the gun for optimal application, but I've also read references here regarding turning the pressure up or down to achieve desired effects. (i.e. Will a higher pressure increase the atomization of the paint?) What effects can be achieved by increasing or decreasing the air pressure?
Are there additional adjustments on a spray gun?
Thanks in advance.