3M Series 55 Benutzerhandbuch
39
Troubleshooting
Problem
Cause
Remedy
Bad Spray Pattern
Air cap or nozzle clogged
Clean with appropriate solvent
Bent fluid needle
Replace fluid needle
Blistering
Moisture on surface
Clean surface
Wrong solvent
Check solvent
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
Too much fluid pressure
Reduce fluid pressure
Not enough atomizing pressure
Increase atomizing pressure
Intermittent Pulsating Spray
Worn or loose packing
Tighten or replace
Low fluid pressure
Add fluid or increase fluid pressure
Insufficient Fluid Flow, Pressure Feed
Restriction in fluid line Blocked hose
Use 3/8” fluid hose Flush or replace hose
Fluid nozzle too small
Use larger needle/nozzle
Low fluid pressure
Increase fluid pressure
Coarse or Lumpy Surface
Dirt or dust on surface
Tack wipe before spray
Material is contaminated
Change or strain
Mottled Looking Surface
Coating too thin
Use less thinner
Coats too wet
Use less thinner
Improper spray technique
Ensure gun is parallel to work
No Paint Flow
Clogged fluid nozzle
Clean fluid nozzle
Loss of fluid pressure
Out of paint
Clogged air passage
Clean with solvent
Restriction in mat’l hose
Flush with solvent
Clogged check valve
Replace check valve
Orange Peel
Paint drying too fast
Use proper solvent
Gun too far from target
6-8 inches is ideal
Viscosity too high
Reduce with solvent
Overspray is Excessive
Gun too far from target
6-8 inches is ideal
Too much atomizing air for coating being
sprayed
sprayed
Reduce atomizing air
Pin-Holing, Solvent Pops
Trapped solvent
Apply lighter coats
Improper solvent
Check coating manufacturer
System contaminated
Clean all parts
Paint Leak
Wrong needle size
Replace
Damaged-worn needle
Replace
Loose fluid nozzle
Tighten or replace
Worn/loose packing nut
Tighten or replace
Needle not closing
Packing too tight. Broken or missing needle
spring. Dried paint on needle.
spring. Dried paint on needle.
Loose fluid fitting
Tighten or replace