Reasons:
Extremely thick or thin coating application, high application viscosity, improper thinner use, low air-pressure, hot surfaces, air circulation in the application chamber, hot application chamber

Elimination methods:
Increase film thickness if it is low. Reduce the distance between the surface and the pistol. Reduce the viscosity. Increase the coating’s flow rate. Increase the air pressure. Make sure, that you use a proper thinner.

Reasons:
Improper thinner use, insufficient temperature and air circulation in the application chamber, rapidly evaporating thinner use on wet and cold days

Elimination methods:
Make sure, that you use a proper thinner, and use retarder

Reasons:
Silicon contamination, contaminated coating cabin, contamination in air circulation

Elimination methods:
Use filter and clean the application area, increase film thickness

Reasons:
Low film thickness, insufficient flash-off time for base coat, improper gun set selection, holding gun far from the surface, improper thinner use, high room temperatures in the chamber.

Elimination methods:
Increase film thickness if it is low. Reduce the distance between the surface and the pistol. Reduce the temperature in the chamber. Make sure, that you use a proper thinner. Make wet application.

Reasons:
High film thickness, keeping pistol close to the surface, slow motions of pistol, improper pistol set selection, low air-pressure, very high or low viscosity values, improper thinner use, narrowing spray range without reducing coating’s flow rate

Elimination method:
Reduce film thickness, increase the distance between the surface and the pistol, move the pistol more quickly, reduce coating’s flow rate, make sure, that you use a proper thinner

Reasons:
Oily and contaminated surfaces

Elimination methods:
Make sure that, the surfaces are cleaned properly

Reasons:
Holding the gun far from the surface, gun’s passing over the surfaces very rapidly, improper thinner use, rapid thinner use on warm days, extremely low viscosity, and improper gun set selection, low air-pressure

Elimination:
Make more wet application, decrease the distance between the surface and the gun, decrease air-pressure, increase nozzle diameter of the gun, use retarder, and make sure, that you use a proper thinner

Reasons:
Insufficient flash-off time, high film thickness, high room temperatures, improper thinner use

Elimination methods:
Increase Flash-off time, reduce viscosity, reduce air-pressure, increase spray distance, make sure, that you use a proper thinner, use retarder

Reasons:
Improper thinner use, thick film application in case of air-drying coatings, low room temperatures (for air-drying coatings), improper mixing ratio or improper hardener use in case of 2-component coating, insufficient metal and oven temperatures in case of oven-drying coatings.

Elimination methods:
Make sure, that you use a proper thinner, reduce film thickness, check the room temperature, check mixing ratios and hardeners in case of 2-component coatings, check metal temperature in the oven.

Reasons:
Wet application, extremely high film thicknesses, improper gun set selection, insufficient flash-off time for base coat, holding gun close to the surface.

Elimination methods:
Reduce film thickness, make dry application, increase the distance between the gun and the surface, increase flash off time for the base coat, decrease nozzle diameter of the gun.

Reasons:
Insufficient surface preparation, insufficient porosity on the surface (insufficient sanding), extremely high film thicknesses.

Elimination methods:
Remove contamination from the surface, make sanding, and reduce film thickness.