Update I have sprayed etch and then polyprimer on the firewall and on the winshield area covering all the bare metal.All of the other bare metal parts are inside fer now.I will etch and prime them soon after a light sanding.The ol binks 18 sprayed the etch on real good as it was a (2 part? ),activator and etch 50/50 mix.On the other hand the polyprimer was real hard to get a wet spray it sprayed real dry.I adjusted the gun as far as it would go each way and seemed to make little difference.The etch was thin and sprayed at a recomended 30-40 lbs .I turned up the pressure to 55 - 60 lbs for the primer still no response.Heres my setup a 5 hp 13.9 cfm @ 90, 10' ft of hose , air reg with water filter, 2' of hose, a big 2 filter water/oil seperator ,50' more hose then connected to the binks 18. I was able to make the primer wet and flow by holding the gun at aprox 6 inches away and moving slow.The (cigar?) shape was 3 inches tall and about 3/4 wide.Adjusting the upper setting ( air?) almost all the way in seemed to wet the spray, but out dried it.The lower setting seemed to wet the mix slightly and much turnin made little difference here.Since i have seen pro painters in action I knew to look for the (glaze) as he called it and then carry it leaving no dry areas but no runs which was difficult with the little cigar pattern.The spray volume was about that of a rattle can only with a nice cigar shape lol!!!!and a little dry It was fun I learned something new. It was a rusty ol piece of metal anyway I cant do too much irepairable damage with the sprayin I hope