What is the function of the intermediate coat?

[JasperFitz]

Intermediate coat functions: It can firmly adhere to the surface of the primer and easily bond with the topcoat layer above. The intermediate coat needs to have good bonding strength and adhesion with both upper and lower layers, as well as surface leveling properties to eliminate surface imperfections such as pinholes and texture of the object being painted. This creates a smooth surface, resulting in a flat and full surface after applying the topcoat, enhancing the overall clarity and fullness of the paint film. Automotive paint is a protective film sprayed onto vehicles, serving as a type of coating that makes the car body less susceptible to corrosion while also providing an aesthetically pleasing appearance. Different automotive paints produce different effects.