Help with UV Clear Solvent Pop

Desperate times call for desperate measures. I would mix a batch, then take your gun to a completely different shop and shoot a reducer can. If no pop, I'd hook up your final air hose to the gun as well. If still no pop, at least you will have eliminated your materials, mixing station, technique, humidity and hose as the cause of the problem.

I know you've changed compressors, but contamination can stay in the pipes and hoses for quite some time.

I hope this wasn't a stupid suggestion. I paint a car about once every three years, so I don't have the experience you guys have.
 
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1st coat is usually water in line or
Cheap reducer in base with high water content.
or the area that caused the issue has excess base/ not enough flash before clear. in base in that spot.

Remember if you do say 3 coats of base on a bumper some spots will have 4-6 coats in over lap areas or creases.
 
I believe I solved the problem to this because I battled the same problem...I like Nokin tried EVERYTHING to solve this.

For me, the problem was the spray gun regulator. I had a 3M cheater valve type. I believe that the cheater valve style mixed with LPH80 mini gun which is designed to run at 7PSI -14 PSI was the problem.

I literally replaced everything from A to Z. Even bought a new LPH-80. When I took the gun apart, I noticed some clear chunks inside the gun.

I noticed when I set the Wall PSI to 120 and when you pull the trigger on the LPH80 you get a large burst of air, then the low pressure. I think its over atomizing the clearcoat. Ever since I switched to the Devilbiss Diaphram Style Digital at 16-18 PSI the problem is solved. I think the way it regulates the air is different and proper method.

Another cool trick I learned while trying to solve this problem is I got a 20lb C02 tank. I bought a high flow fixed 150PSI regulator. I hook air compressor up to the quick connect fitting and you have instant air with no noise. The 20lb tank is equal to 800 gallons of compressed air at 125PSI.

Works good for painting in a ventilated area, just gotta be careful because too much co2 in air can suck up the oxygen lol..
 
So was this different than your other problem in that other thread that went on forever? Cause most of what you said here in your post was never mentioned in the other thread. :confused: I specifically recall Barry talking about one of your issues being CO2 degassing. Here you mention using CO2 as your propellant. IIRC you said that upping the air pressure 1psi at the gun solved all your issues? Find that hard to believe.
 
Me and Nokin and several others had same problem...We all tried everything to fix it. I replaced everything I had from A to Z and still was having problems...

I nearly gave up, I bought a Preval Sprayer...Which is a co2 aerosal sprayer. I tried spraying with that and the issue went away...So I got idea to try a co2 tank as propellant that regulated down to 20 PSI. It worked...

The problem was that I honestly didn't know the difference between a Diaphragm and Cheater Valve was...

I tried so many different settings. High PSI at my wall, to low PSI at my wall. I was stuck on the moisture idea which it wasnt. I figured the co2 was moisture free and eliminated the moisture possibility.

Everyone told me to go higher PSI, and the issues got worse. But then I went low PSI but higher on my cheater valve it got better...Now that I understand what problem was, it makes sense that 120PSI being regulated down to 16 psi on LPH80 the air velocity was through the roof. It was causing the clear to likely skin over too fast. Also the clumps I was getting was likely iso clumping due to the over atomizing of the clear.

The answer was simply just a digital devilbiss diaphragm regulator.
 
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Yep, but I'm embarassed to say what it really was! It's not the clear or the air or the environment.
 
Yep, but I'm embarassed to say what it really was! It's not the clear or the air or the environment.
Hi Nokin, another user called ebaypdllc had the same problem that i have( bubbles/small craters). He solved the problem with high air pressure(if i remenber correctly) but if i spray at 20 or 45 psi It doesn't change anything. I tried every possible settings. I have an Asturo h827 (same as the hf purple spraygun) and i do everything as per data sheet.
 
I do custom airbrushing work, it was the transfer tape I was using that left behind it's adhesive, causing the clear to have a reaction.
Nothing embarrassing about that problem. I have a bad habit of using cheap tape. and maybe not degreasing to the extent that I should. I'll be a lot more careful from now on, thanks to this tip.
 
I would never have guessed this in a million years, thank you for sharing it with is!
It took me that long to figure it out! I was about 20% into the 100 yard roll when the problems started. I used about 5 feet a week, so about a year and half before I found out.....
 
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