Description of problem:
The sprayed paint dust particles land on the painted surface in the form of a powder.
Causes:
Spray gun is too far from the painted surface.
Spray pass is too quick.
Unsuitable thinner.
Very high air pressure.
Incorrect application viscosity.
Wrong spray gun setting. Small nozzle with a large air cap.
Ambient air flow is disruptive.
Spray booth temperature is too high.
Preventive measures:
Use proper application technique.
Use appropriate thinner.
Use correct air pressure.
Use correct application viscosity according to the manufacturer’s specification.
Use slower thinner or add a retarder if it is too hot.
Use correct spray gun setup.
Avoid turbulence.
Remedy:
Ground coats:
Remove with thinner or wait until dry and sand topcoats sand with P1200 and polish.
In the case of metallic monocoat finishes (600 series) you should sand and respray.