3M 3M Needle/Nozzle/Air Cap Selection Guide, Troubleshooting, 3M Series 05-100 Spray Gun

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

Troubleshooting

Problem	Cause	Remedy
Bad Spray Pattern	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
Fish Eyes	Air contamination	Add air filtration
	Silicone contamination	Clean surface with solvent
Heavy Middle Pattern	Not enough atomizing pressure	Increase atomizing pressure
Intermittent Pulsating Spray	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
Coarse or Lumpy Surface	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
No Paint Flow	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
Orange Peel	Gun too far from target	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
	Gun too far from target	6-8 (160-200 mm) inches for Series 05-100
Overspray is Excessive		4-6 (100-160 mm) inches for Series 05-300
	Too much atomizing air	Reduce 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
Paint Leak	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
		3

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