Electrostatic spray coating technology is a surface treatment technology that has been rapidly developed in recent years. Its characteristics are solvent-free, environmentally friendly, powder can be recycled, easy to automate production, easy to use, and various coating colors can meet different requirements. Weather resistance performance requirements. However, there are often some defects in the electrostatic assembly line that affect the appearance quality and performance of the product. The following is a brief introduction to the common causes of coating defects and control measures.