CorvettCrzy
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'58 Corvette, '64 Franklin
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Post by CorvettCrzy on Aug 15, 2018 7:09:42 GMT -8
nccamper Both when we first primed the camper and today when we primed the door, our gun "spits" the primer out. We thought it maybe the paint was too thick so we added some more Flotrol and it still spit, maybe it was a little better. Do you think it's because it's too thick? The can says you can thin with clean water also. Would appreciate your thoughts.  Prime door and spot prime by Corvett crzy, on Flickr Finally he just held the trigger down and moved the gun around to try to get it covered. Note we mixed 10 oz of paint just to do the door, so there should have been enough. We stopped because we didn't want additional problems.  Prime door and spot prime by Corvett crzy, on Flickr
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nccamper
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1962 Forester- 1956 Shasta
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Post by nccamper on Aug 15, 2018 7:43:11 GMT -8
I had the same issue. I used a cheap bottom tank gun which handled the thicker primer.
Check out the tutorial about half way down.
You should fine sand the primer already sprayed.
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Alaska Shasta
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1964 Shasta
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Post by Alaska Shasta on Aug 15, 2018 8:47:32 GMT -8
I would increase air pressure to about 40 to 50 PSI at the gun, and if that didn't do it, I would thin the paint some more. By adjusting both air pressure, and viscosity, I believe you will solve this. The air coming out of the side orifices in the air cap horn are what makes the fan pattern as well as breaking up the paint fluid into smaller particles. Pressure and viscosity are crucial to a fine mist pattern. A common misconception on HVLP guns, if that is what you are using, is when the packaging says 10 PSI, that is the pressure they use at the gun. HVLP guns reduce the line pressure to the lower cap pressure internally. That is why I would try 40-50 PSI at the gun.
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kudzu
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Post by kudzu on Aug 15, 2018 8:58:16 GMT -8
Did the gun work before?
Have you taken it apart and THOROUGHLY CLEANED IT?
Since you are spraying latex I would assume it is to thick and your nozzle is to small.
Many water based are thick enough you need a gun for spraying latex or to change to a bigger nozzle
I had a gun go bad. Nothing we did would make it spray right. We tore it apart, cleaned it a couple of times and it would just never work right and it had a air leak we could hear. Could not find anything wrong either. Decided it must have a bad casting. Bought a new one and used if for spare parts.
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Post by danrhodes on Aug 15, 2018 13:34:10 GMT -8
I sprayed one coat well. The next day, same issue as you. I solved with a combo of thinning paint much more, cleaning gun well and bumping up spray pressure.
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