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Troubleshooting
Problem
Cause
Remedy
Air cap or nozzle clogged
Clean with appropriate solvent
Bent fluid needle
Replace fluid needle
Moisture on surface
Clean surface
Wrong solvent
Check solvent
Blistering
Coats not compatible
Check material compatibility
Insufficient dry time
Longer dry time
Surface too cold
Warm surface
Air contamination
Add air filtration
Silicone contamination
Clean surface with solvent
Heavy Middle Pattern
Not enough atomizing pressure
Increase atomizing pressure
Worn or loose packing
Tighten or replace
Low fluid in cup or pot
Add fluid
Insufficient Fluid Flow
Fluid nozzle too small
Use larger needle/nozzle
Dirt or dust on surface
Tack wipe before spray
Material is contaminated
Change or strain
Coating too thin
Use less thinner
Mottled Looking Surface
Coats too wet
Use less thinner
Improper spray technique
Hold gun perpendicular to work
Clogged fluid nozzle
Clean fluid nozzle
Loss of air pressure
Check cup gasket
Loss of fluid
Out of paint
Clogged air passage
Clean with solvent
Paint drying too fast
Use proper solvent
6-8 (160-200 mm) inches for Series 05-100
4-6 (100-160 mm) inches for Series 05-300
Viscosity too high
Reduce with solvent
6-8 (160-200 mm) inches for Series 05-100
4-6 (100-160 mm) inches for Series 05-300
Too much atomizing air
for coating being sprayed
Trapped solvent
Apply lighter coats
Pin-Holing, Solvent Pops
Improper solvent
Check coating manufacturer
System contaminated
Clean all parts
Wrong needle size
Replace
Damaged-worn needle
Replace
Loose fluid nozzle
Tighten or replace
Worn/loose packing nut
Tighten or replace
Packing too tight
Needle not closing
Broken or missing needle spring
Dried paint on needle
Tilted gun
Do not tilt while spraying
Bad Spray Pattern
No Paint Flow
Gun too far from target
Gun too far from target
Intermittent Pulsating Spray
Coarse or Lumpy Surface
Fish Eyes
Orange Peel
Overspray is Excessive
Reduce atomizing air
Paint Leak
3M™ Needle/Nozzle/Air Cap Selection Guide
3M™ Series 05-100 Spray Gun
Size
Description
Replacement PN
1.5 mm
Air Cap and Needle Kit
97-134/1.5
1.8 mm
Air Cap and Needle Kit
97-134/1.8
2.0 mm
Air Cap and Needle Kit
97-134/2.0
3M™ Series 05-300 Spray Gun
Size
Description
Replacement PN
0.8 mm
Needle Kit
97-210/0.8
1.0 mm
Needle Kit
97-210/1.0
1.2 mm
Needle Kit
97-210/1.2
