Normal behavior?

Todd Gatman

New Member
My spray gun started sputtering a bit the other day. First time ever. So I cleaned it better than I ever have. When I was finished, I put some solvent in the paint cup and everything seemed good. I saw that when I released the trigger however, some bubbles appeared in the cup, but not during spraying. Is this normal? You can imagine that I usually am not looking in the paint cup when spraying so I never noticed this behavior. I figure someone here has to know.
 

Dave C 5

Member
Had that happen to me - tip is not tight enough OR most likely the vent hole in the top of your lid is plugged or needs to be enlarged a bit
 
My spray gun started sputtering a bit the other day. First time ever. So I cleaned it better than I ever have. When I was finished, I put some solvent in the paint cup and everything seemed good. I saw that when I released the trigger however, some bubbles appeared in the cup, but not during spraying. Is this normal? You can imagine that I usually am not looking in the paint cup when spraying so I never noticed this behavior. I figure someone here has to know.
I think I understand what you are saying. I run some thinner through the gun without the airline attached after i clean, (without lid on) just as a final flush. I think thats what you are referring to? I also observe bubbles coming back into the cup after the first squeeze of the trigger. My guns always do this. I think its that air gets trapped in the gun initially as you pour in the material, and the bubbles are just the trapped air escaping. Like I said, my guns always do this and its never been a concern.
 

Jorge M.

Member
I think I understand what you are saying. I run some thinner through the gun without the airline attached after i clean, (without lid on) just as a final flush. I think thats what you are referring to? I also observe bubbles coming back into the cup after the first squeeze of the trigger. My guns always do this. I think its that air gets trapped in the gun initially as you pour in the material, and the bubbles are just the trapped air escaping. Like I said, my guns always do this and its never been a concern.
I had a SATA gun that started behaving just like you describe, and sure enough I had to really tighten up the nozzle fluid and the problem went away. Worth trying it out on your gun to see if it’s a quick fix.
 

AAE

Learner
As a side note, if you loosen the air cap, put your finger over the holes in the cap, reduce your pressure way down ( to almost nothing)and pull the trigger, those bubbles will help clean the innards.
 

John Long

Member
Be sure the packing nut is tight enough where your fluid needle goes into the gun. If it is loose it will suck air and cause it to sputter.
 
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