Wasn't sure if this was right for the Airbrush section, because it's not *really* an airbrush.. I bought a HVLP detail gun (Harbor Freight) and have a troubleshooting question. There are two parts to this that may be causing the problem I'm having. I was going to run some cleaner through the gun from the cup. The manual stated that it needs to be disassembled and the needle/head/etc. soaked in cleaner (warm water and soap, while some videos suggest thinner) in order to remove the manufacturing lubricant (which appears to be Kerosene or similar). Initially running just water through it, I ran into the following problem. It sprays for about 1/2 to 1.5 seconds, then stops, and instead kicks back up into the cup. I *suspect* it's an air pressure issue. I have my main compressor set to around 40 to 45, but it's difficult to really nail down. The HVLP came with an in-line regulator, but ...well.. let's just say I have issues with regulators in general. If someone could point me to an idiots guide to using regulators, I'd love to see it, because with the air compressor set at 45, it seems to me that fine tuning it at the in-line regulator would be easier, but if I try to go below 40psi (not for the HVLP, but just to test), the knob that adjusts the pressure starts to leak air. Are you supposed to adjust the pressure with the line open? Is a *lack* of pressure possibly causing the problem with the spray gun? Is the regulator that came with the spray gun just a piece of crap? If so, can anyone recommend an in-line regulator that is less than $50? Thanks.