3M Series 56ZZ - Manual (Page 40)

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
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.
Loose fluid fitting Tighten or replace