Phenomenon：The bumps and scratches on the surface of the paint film.

Phenomenon： Substrate, paint film and coating, the adhesion between layers is very poor, causing some or even all of the paint film or clad layer to peel off.

Phenomenon：The phenomenon that the plating layer is burnt black or yellowed.

Phenomenon：The color of the coating layer is grayish white, and the metallic luster of the mirror effect is lost.

Phenomenon：The coating layer produces relative movement.

Phenomenon：The phenomenon of whitening and coloring occurs when the paint is not cured completely.

Phenomenon：The edge or part of the workpiece is rough and dumb. 3、Causes and

Phenomenon：The phenomenon that the paint film is milky white.

Phenomenon：The paint film presents irregular colors like rainbow markings .This phenomenon cannot be eradicated in the industry, and it can only be reduced to a certain extent by adjusting the film thickness.

Phenomenon：The phenomenon that the color of the surface coating is uneven and condensed into one piece is also called floating, which is also called poor color contrast properties in the industry.