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Spray Gun Troubleshooting
DEFECTS CAUSE CORRECTION
Coarse spray Low pressure Increase the pressure
Excessive fogging High pressure Reduce pressure for satisfactory pattern
(overspray) Material too thin Use less thinner
Pattern too wide Spray angle too large Use smaller spray angle tip
Pattern too narrow Spray angle too small Use larger spray angle tip. (If coverage is OK,
try tip in same nozzle group)
Too much material Tip size too large Use next smaller tip
Material too thin
Pressure too high Reduce pressure
Too little material Tip size too small Use next larger tip
Material too thick
Thin distribution in Worn tip Change for new tip
center of pattern Wrong tip Use tip with a smaller spray angle
"horns"
Thick skin on work Material too viscous Thin material
Application too heavy Reduce pressure and/or use smaller tip
Coating fails to Material too viscous Thin material
close & smooth over
Spray pattern irregular, Orice clogged Clean carefully
deected Tip damaged Replace with new tip
Craters or pock marks Solvent balance Use 1-3% "short" solvents remainder "long"
solvents. (This is most likely to happen with
material of low viscosity, lacquers etc.)
Bubbles on work Contamination or dust Clean surface to be sprayed
Clogged screens Extraneous material Clean screen
in paint.
Coarse pigments Use coarse screen if orice size allows
Poorly milled pigments Use coarser screen, larger orice tips. Obain ball
(paint pigments glocculate milled paint. If thinner was added, test to see if a
cover screen. Incompatible drop on top of paint mixes or attens out on
paint mixture & thinners. on the surface. If not, try different thinner
in fresh batch of paint.
TEST THE PATTERN
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