Skipping:
Dirty airbrush - refer to Maintenance Section
Pigment too thick
Air pressure too high
Improper nozzle/body connection
Bad nozzle (#4)
Dried Paint on tip of needle
Refer to Maintenance Section

Double line:
Dirty airbrush - refer to Maintenance Section
Bent needle
Debris on tip of nozzle (#4) or in nozzle cap (#2)
Bad nozzle
Dried paint on tip of needle
Refer to Maintenance Section

Spattering:
Dirty airbrush - refer to Maintenance Section
Pigment build-up in needle cap (#1)
Pigment too thick
Air pressure too low
Dried paint on tip of needle
Refer to Maintenance Section

No Spraying:
Clogged nozzle - refer to Maintenance Section
Loose nozzle cap (#2 hand tighten only)
Loose needle chucking nut (#18)
Improper air pressure
Paint too thick
Bad nozzle (#4)
Refer to Maintenance Section

Bubbling in fluid cup or bottle:
Loose nozzle cap (#2 hand tighten only)
Improper nozzle/body seal
Bad nozzle (#4)
Refer to Maintenance Section

Trigger sticks or does not move smoothly:
Use Medea Super Lube around the air valve piston packing (#7 o-ring) and/or in the trigger (#12) chamber
Refer to maintenance section