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the passage might not be cleaned and is blocked.
take the air cap off make sure u can see all the holes thru the lights. take the nozzle and the cup off. see if there's any build-up inside that might possibly block the paint coming out.
over all, clean the gun good with thinner
First start with the basics, whats the paint VISCOCITY ON A FORD 4 CUP ??
Or Does it run nicely off the stick you stirred it with??
If its thin enough to go up the tube and lines, whats the fluid tip and air cap combo your using?? maybe start with a EX fluid tip (1.8mm) and 30b air cap (cos that sprays everything!!) and reduce from there.
Whats the pot pressure?? Is it a KBII pot? cos they suffered with the air inlet blocking, so IT SHOWS GOOD PRESSURE, but doesnt have it in the pot!
Replace or clean with spray carburetor cleaner, the fuel filter which is likely plugged. Make sure the fuel tank vent is open. Sometimes, a fuel system cleaner is helpful like 'Seafoam". Make sure the oil is clean and topped up. A muffler can sometimes plug up and cause a similar problem. Hope this helps!
There are different filter screen sizes for different thickness of paint. Even with proper screen size one might need to thin paint. I hope this information is helpful. Please give a rating if this was helpful. Good Luck and have a Great Weekend.
There are a number of possible causes. These are compounded by the different types of guns like HVLP and what would an older style. Also are you using a pressurized, gravity feed or siphon gun. However, the reason for spatter is improper atomization of the air and paint. The most common causes are incorrect air flow or incorrect paint viscosity. If you don't have a way to check the viscosity get one. I painted in factory repair area that used a pressurized system. On any given day there might be 9 to 12 colors we used. Each one would have a different vis. Air adjustments could range from 50 psi. to 95 psi. This will hold true for almost any type of paint.
Spraying smooth needs both the right airflow and right viscosity. Since your getting lap lines I would say your putting it on too thick. Thin down your coat, it should be approximately the thiness of water.
I spoke to a friend who was a spraypainter in his last job, apparently due to the thickness of the paint, I needed a larger nozzle on the gun. I couldnt get a nozzle to suit this gun so I purchased another gun with a cuple of different size nozzles. All seems to be working fine now.