Trying my hand at polyester primer again because I have heard people go on and on about how amazing it is. Well I can't get the shit to spray right at all. At first I used a cheap gravity feed conventional gun with a 2.0 tip, it would spray ok but I had to hold the gun real close to the panel...like 2 inches away and then I had to travel real slow, even then it left a lot of orange peel. I could turn the fan down to almost zero and spray but thats just not a very good way to do it. After trying other options like thinning and adjusting the gun every which way. I opted to buy a new gun...a HVLP gravity feed with a 2.5 tip. Its not the most expensive gun ever, but it seems like a good one. Now I just tried it out with some slick sand, same problem...it would'nt spray at all unless I turned the fan down all the way, then it was like a hose. I tried adjusting the fluid tip and the air pressure till I was blue in the face and got no results. There are two air regulators one at the bottom of the handle and one right where the air line connects. I can thin the stuff down like milk and get a good even spray but that defeats the purpose of the slick sand I think. One more thing, I noticed on the new HVLP gun is the paint in the cup bubbles when I pull the trigger, not a whole lot just kinda blurps every once in a while. I have painted before, 2k primers, metallic base coats and clears...I got good results from these so I am thinking that there has to be a simple explanation for this. What are your thoughts on this, the max air pressure at the air cap is 10psi...how exactly do you know what psi you have at the cap? Is this stuff just too thick? Will I just need to spray more coats if I do thin it to get a good build?