AIRLESSCO GS800 - Manual (Page 18)

Troubleshooting
18 3A1186F
Test the Pattern
Airless Spray Gun
Problem Cause Solution
Coarse spray Low pressure Increase the pressure
Excessive fogging (over-
spray) High pressure Reduce the pressure to satisfactory pattern dis-
tribution.
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 tip group)
Too much material Tip too large Use smaller tip
Material too thin
Pressure too high Reduce pressure
Too little material Tip too small Use next larger tip
Material too thick
Thin distribution in center of
pattern “horns” Worn tip Change to new tip
Wrong tip Use nozzle with narrow spray angle
Thick skin on work Material too viscous Thin cautiously
Application too heavy Reduce pressure and/or use tip in next smaller
tip size
Coating fails to close and
smooth over Material too viscous Thin cautiously
Spray pattern irregular,
deflected Orifice clogged Clean carefully
Tip damaged Replace with new tip
Craters or pock marks, bub-
bles on work Solvent balance Use 1 to 3% “short solvents remainder “long”
solvents (this is most likely to happen with mate-
rial of low viscosity, lacquers, etc.)
Clogged screens Extraneous material in paint Clean screen
Course pigments Use coarse screen if orifice size allows.
Poorly milled pigments (paint
pigments glocculate) Use courser screen, larger orifice tips. Obtain
ball milled paint. If thinner had been added, test
to see if a cover screen. Incompatible drop
placed on top of paint mixes or flattens out on
the paint mixture and thinners on the surface. If
not, try different thinner in fresh batch of paint.
Good, Full
Spotty Pattern,
Increase Pressure
ti15991a