With the joint venture of the sedan industry and the introduction of products, world-renowned automotive paint manufacturers such as PPG, DuPont, BASF, Kansai, and Nippon have been attracted to invest in China. Establish a joint venture or sole proprietorship automotive paint company to become the main supplier of automotive paint.

The fundamental basis for whether the market can be opened is still the quality of the goods. The quality of a commodity refers to both its internal quality and its external form. A good product must be both internal and external.

Shrinkage, usually centered around a droplet or small piece of impurity, forms a circular edge around it. The primer can be seen as the substrate, and the topcoat can be seen as the primer. The edge paint film shrinks towards the center, and there is no paint film on the edge or the paint film is very thin. This phenomenon is mainly related to surface tension. When the surface tension of the coating is high and the surface tension of the substrate is too low, it can cause shrinkage.

Due to the loss of adhesion between the coating and the surface of the workpiece or between the new and old paint layers, the coating surface forms small flakes or scales that detach, which is called "peeling". When the adhesion between the coating and the surface is completely lost, causing the entire film to fall off, it is called 'detachment'.