Graco PerformAA 15 Instructions - Parts Manual page 26

Troubleshooting
Problem
Irregular pattern
Fogging, overspray, or dry spray •
Paint runs or Paint Coverage
Thickness
Rough finish or specking
26
Possible Causes
• Spray tip partially
plugged
• Dirty or plugged air
cap holes
Too much atomization
air
• Too high of fluid
pressure
• Incorrect tip size
• Too much fluid flow
• Tip worn
• Incorrect tip size
• Operator spray
technique
• Too much atomization
air
• Too much fan pattern
adjustment
• Too much distance
between gun and part
Solutions
• Clean or replace tip
• Clean or replace air cap
• Test different types of air
caps
• Reduce air pressure
• Decrease fluid pressure
• Increase tip orifice size
• Check tip wear and flow
rate
• Decrease tip orifice size
• Review operator
technique
• Decrease air pressure
• Decrease tip pattern size
• Adjust gun to part
distance
Why it is
important
• Even and
blended finish
• Even 50%
overlaps
• Even paint
thickness and
coverage
• Increase
transfer
efficiency
• Decrease
overspray
• Improves
spray booth
cleanliness
• Minimizes runs
• Maintains
transfer
efficiency
• Even paint
thickness and
coverage
• Even 50%
overlaps
• Increases
wetness of the
paint on the
part
• Allows material
to flow evenly
• Even / blended
finish
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