need the tip as well as the needle, and a bigger tip will allow thicker paint to flow and atomise better, out of the gun,if its grainy and dust may be ur not putting it down wet enough, after first 2-3 light coats.
i can spray faskoat or auto air fluro through my .35 airbrush nps but i thin it down and spray at 25-35 psi
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Mattys the driver,my names carl
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