TM 55-1500-345-23
Manual Spray Coating Troubles, Possible Causes, and Remedies
PREVENTIVE MEASURES OR
TROUBLE
POSSIBLE CAUSES
REMEDIES
1.
1.
Remove air cap and clean tip and air cap
Sags and runs
Dirty air cap and fluid tip (distorted spray
carefully.
pattern).
2.
2.
Gun stroked too close to the surface.
Maintain 6 to 10 inches distance from
surface.
3.
3.
Trigger not released at end of stroke
Release the trigger after every stroke.
(when stroke does not go beyond object).
4.
4.
Gun stroked at wrong angle to surface.
Keep gun at right angle (perpendicular)
to surface during stroke.
5.
5.
Heat material by approved methods.
Coating material too cold.
6.
6.
Develop ability to apply thicknesses by
Coating piled on too heavy.
panel practice.
7.
7.
Coating material thinning too much.
Add the correct amount of solvent by
measure or determined by viscosity test.
8.
8.
Incomplete mixture of components.
Continuous agitation of mixture.
NOTE
Pot life must be considered when
using plural component paint.
Pot life is approximately 8 hours
after mixing. Serious gelation oc-
curs after 6 hours, at which point
viscosity will impede the flow and
ultimately completely stop the
system. It is recommended that
the system be flushed after 6
hours to preclude damage to the
system.
1.
1.
Remove air cap and clean tip and air cap
Streaks
Dirty air cap and fluid tip (distorted spray
carefully.
pattern).
2.
2.
Follow the previous stroke accurately.
Insufficient or incorrect overlapping
Deposit a wet coat.
strokes.
3.
3.
Avoid whipping. Make deliberate, slow
Gun stroked too rapidly (dusting of the
strokes.
paint).
4.
4.
Gun stroked at wrong angle to surface.
Keep gun at right angle (perpendicular)
to surface during stroke.
5.
5.
Stroking too far from surface.
Maintain 6 to 10 inches from surface.
Too much air pressure.
Use least air pressure necessary.
6.
6.
7.
7.
Split spray.
Clean the fluid tip and air cap.
8.
8.
Coating material too cold.
Heat material to get good flow-out. (Use
authorized heat methods).
Paint will not
1.
Add paint, correctly thinned out and
1.
Out of paint (gun begins to sputter).
come from spray
strained.
gun
