I purchased a cheap HVLP gun at HF to do some spraying. The question I have is about pressure. the manual states to run it about 40psi, and never run it higher than that. i have a small regulator at the gun, and one at the compressor end. when i set the compressor regulator at 45, i get about 40 at the gun (i have to use about 75' of 3/8" hose to get where i need to spray as the compressor is a large tank in the garashop). however, when i start spraying, it drops down to the 20 psi range whilst i'm spraying, and going back up when i release the trigger.
when i crank the pressure up at the compressor regulator, the pressure then, of course, goes up at the gun. when i start spraying, the pressure drops pretty quickly, then rises back up when stopping spraying.
this is my first experience with an hvlp, so is this normal? is the
20psi during spraying good enough? it seems to be spraying a pretty fine mist at 20psi when i did my testing with plain water.what i'm spraying is mostly water anyway, so it shouldn't be too much different viscosity.
thanks, charlie