Description of problem:
The paint is slightly granulated resembling the outside of an orange.
Causes:
Bad spraying technique. The gun is either too far away or too close.
Application thickness is either too little or too much.
Thinner is too fast drying.
Viscosity is too high.
Incorrect air pressure.
Temperature is too high.
Insufficient sanding of substrate.
Incorrect spray gun set up.
Preventive measures:
Use correct spraying technique.
Adjust the air pressure so as to minimize the “poussierage”.
Use slower thinner or retarder.
Use recommended thinning ratios.
Use recommended gun set up.
Prepare and sand substrate correctly.
Remedy:
In minor cases, wait until the paint is fully dry and polish with a coarse compound and then a fine compound.
In more serious cases, you may have to sand with P1200 and polish.
In extreme cases you should sand with P500/P1000 and respray.