CONDITION
Starved spray pattern
Excessive overspray
Excessive fog
Dry spray
Fluid leaking from
packing nut
Fluid leaking or
dripping from front of
gun
Fluid dripping or
leaking from bottom of
cup
Runs and sags
Thin, sandy coarse finish
drying before it flows
out
Thick, dimpled finish
"orange peel"
77-3026-R2.0 (9/2014)
TROUBLESHOOTING
CAUSE
Inadequate material flow.
Low atomization air pressure.
Too much atomization air pressure.
Gun too far from work surface.
Improper stroking (arcing, gun motion too
fast).
Too much or too fast-drying thinner.
Too much atomization (air pressure.)
Air pressure too high.
Gun tip too far from work surface.
Gun motion too fast.
Gun out of adjustment.
Packing nut loose.
Packing worn or dry.
Packing nut too tight.
Dry packing.
Fluid tip or needle worn or damaged.
Foreign matter in tip.
Fluid needle spring broken.
Wrong size needle or tip.
Cup loose on gun.
Cup gasket worn or missing below cup.
Cup threads dirty.
Too much material flow.
Material too thin.
Gun tilted on an angle, or gun motion too
slow.
Gun too far from surface.
Too much air pressure.
Improper thinner being used.
Gun too close to surface.
Too much material coarsely atomized.
Air pressure too low.
Improper thinner being used.
Material not properly mixed.
Surface rough, oily, dirty.
13 / 16
CORRECTION
Back fluid adjusting screw out to first thread,
or change to larger tip size.
Increase air pressure and rebalance gun.
Reduce pressure.
Adjust to proper distance.
Move at moderate pace, parallel to work
surface.
Remix properly.
Reduce air pressure.
Reduce air pressure.
Adjust to proper distance.
Slow down.
Adjust.
Tighten, do not bind needle.
Replace or lubricate.
Adjust.
Lubricate.
Replace tip and needle.
Clean.
Replace.
Replace.
Tighten.
Replace cup gasket.
Clean.
Adjust gun or reduce fluid flow.
Mix properly or apply light coats.
Hold gun at right angle to work and adapt to
proper gun technique.
Check distance. Normally approximately 8".
Reduce air pressure and check spray pattern.
Follow paint manufacturer's mixing
instructions.
Check distance. Normally approximately 8".
Follow paint manufacturer's mixing
instructions.
Increase air pressure or reduce fluid flow.
Follow paint manufacturer's mixing
instructions.
Follow paint manufacturer's mixing
instructions.
Properly clean and prepare.
EN