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.

[TimothyAnn]

The primary function of the intermediate coat is to create a smoother and more even surface for the car. During the painting process, it fills in minor imperfections on the primer, such as scratches or uneven areas, ensuring that the final color coat adheres uniformly and is less prone to peeling or bubbling. Additionally, the intermediate coat provides a protective barrier against UV rays, rain, and chemical corrosion, extending the lifespan of the paint and preventing rust on the car body. From my experience in numerous repair jobs, skipping this step often leads to paint issues like cracking or uneven gloss, which are more time-consuming and costly to fix. The intermediate coat also helps save materials by reducing the thickness of the topcoat while enhancing overall protection. In modern processes, the composition of intermediate coats has been optimized for better adhesion, ensuring long-lasting gloss.

[Patel]

Last time my car got scratched and I took it for repair, the mechanic emphasized the importance of primer surfacer. It acts like an intermediate layer, filling in uneven areas and making the color coat appear smooth and even after application. My old car didn't have primer surfacer before, and the paint easily bubbled and peeled, looking aged. Now with the new car using it, the paint surface is as smooth as new, easily cleaned by rain, reducing the risk of rust. The cost-saving aspect is that the paint lasts longer, requiring fewer car washes and waxing, thus lowering maintenance costs. In terms of safety, the primer surfacer protects the car body from corrosion, making the vehicle structure stronger. During maintenance, I saw the poor condition of other cars without primer surfacer—their paint cracked and required premature repairs, costing unnecessary extra money.

[Margie]

From an environmental perspective, intermediate coating paint is worth promoting. It reduces the overall amount of paint used because after leveling the surface, the topcoat can be sprayed thinner, which lowers volatile organic compound emissions. With strong protective functions and long-lasting paint durability, vehicles don't require frequent touch-ups, saving resources and reducing waste. My research shows that cars using intermediate coating paint typically need repainting only every five years on average, whereas those without it may develop issues within two years, creating greater environmental burdens. Modern water-based intermediate coatings are even more eco-friendly and safer. In automotive manufacturing, optimizing processes can further reduce carbon footprints.