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Old 01-26-2018, 11:27 PM
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what cause spray paint air cap clog

I recently bought a brand new devilbiss gti prolite which suppose to be top of the line gun for spraying clear coat, it lays down clear very nicely but after few mins of use, the air cap start to build up with material (clearcoat) and eventually clog up the air holes then it shoots out blobs of paint so I had to clean the cap every few minutes of use. I have tried different pressure25-30 psi and still does the same thing. Has anyone got the same issue? what is cause this? and how do you prevent it? Any input would be appreciated.

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Old 01-27-2018, 12:54 AM
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It can be a few things. Bounce back from the surface. Overspray that isn't getting cleared from the room collecting on the aircap. Running out of air pressure. I use a Tekna with 1.2/1.3 for clear with a TE10 aircap. Some of these Hs syrupy clears do better with a little reduction and the TE cap Vs. HVLP caps. I usually end up shooting clear between 20 and 25psi. You can always close up the fan a touch and back up a bit.
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Old 01-27-2018, 11:22 AM
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Not familiar with that gun and its been a long time since I painted, so my advice isn't very specific but its free so here goes.

Assuming that all visible machined passages have been thoroghly visually inspected with strong light and good eye, and that proper cleaning has been done...

Is the buildup heavier to one side? If so, you have a warranty or damage issue. Make a call.

Can you show us the pattern with some thinner on cardboard? Or the buildup, or both? If your issue is ventilation or technique, the pattern should be beautiful. Very even and adjustable. Pics might get some every day painters to chime in also. Maybe this should be in the paint sub-forum, or tools.

If you were to adjust your needle for less fluid and try a technique change from, for example, 2" distance and 50% overlap at high speed to, for example, 3" distance and 75% overlap at medium speed... and got less buildup... that could indicate that its you or your setup. I bet theres a problem with the gun. Just my .02!

But in my experience, air cap buildup indicates improper airflow to or through the air cap, possibly due to machining defects or seals but usually clogging, or poorly machined or damaged fluid needle and or nozzle.
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Old 01-28-2018, 08:24 AM
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Clean it good then try it wide open, fan wide, fluid wide open, see if it still clogs. then we'll go from there. I always try start at the beginning when trouble shooting.
Sounds like air pressure is too low, fluid is choked off, or to thick. but get the gun clean first, spray straight lacquer thinner through it while looking at the fan pattern and see if its any better.
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Old 03-15-2018, 05:45 AM
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I'll agree with that. Not enough paint coming out and not enough air pressure. If your running a screen in the cup remove the screen. ...Wallah...
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