Suction Versus HVLP
Choose the correct type of equipment for the job. In this case, we're talking about the traditional suction-feed high-pressure or the more modern high-volume/low-pressure (HVLP) gun. HVLP spray guns were designed to reduce overspray and get more material to the surface and less into the air as overspray. There is an internal restrictor inside of an HVLP gun that limits the incoming air pressure in order to provide reduced pressure at the air cap. A conventional gun does not have an internal restrictor, and therefore whatever the inlet pressure is set at, the air cap pressure will be the same. With an HVLP gun, you don't have clouds of noxious paint fumes filling the air (or garage), but they use a large volume of air compared to a standard suction-type gun-making compressor capacity a deciding factor.