This is work! And I'm just doing a door first. It's amazing all the little dings and high spots that you uncover when you strip to bare metal. I also decided to strip the interior side of the door with all of its curves and crannies...Brilliant! Anyway, on with my question. It is my first time spraying with a gun (siphone feed, cheepo, I'm ashamed to say how much it and where I got it). Not enough ventiliation, almost passed out even with my respirator...the door which was sprayed in a super clean 7DSS designed paint booth has little strands of black stuff imbedded in the primer. The rocker panel and door jam that were sprayed in the open part of the shop are clean as a whistle....go figure. Lessoned learned. I tried to set my gun up as MARTINSR described in his link, and thought I had it. I sprayed 3 coats of etch, then 3 coats of primer/surfacer. It is the S-W Ultra 7000 series, but it seemed like a whole lot of spraying just to get any coverage with the primer/surfacer. I had to spray 3 "coats" just to cover the body filler spots. Is this normal? I guess I was spooked about runs, so I ran it on the safe side. Should the primer be thick enough to appear real glossy? Mine wasn't, only in spots. I mixed for normal build. After the primer dried, it is feels about as rough as 80 grit. I understand I have to sand it, but didn't know if it was due to the atomization of the gun or not. I guess I could adjust the "material to air" knob out more, but it felt like I bottomed it out. Or could it be the nozzle size? It has a .082" (which I think is roughly 1.8 mm). Seems overkill for the datasheets on the etch, but just about right for the primer. I'll be moving on to another panel soon, just wanted to correct any flaws with a "loose nut behind the wheel". Thanks again.