Which of the following are types of coats?

The correct answer includes primer-surfacers, etch primers, adhesion promoters, and sealers, which are all foundational components in the coating process. These types of coats serve specific purposes that are essential for achieving a quality finish on automotive surfaces.

Primer-surfacers provide a base layer that helps fill imperfections in the underlying material, enhancing adhesion for subsequent layers. Etch primers are used on bare metal surfaces to create a chemical bond that prevents adhesion failure. Adhesion promoters enhance the bond between the substrate and the paint, ensuring longevity and durability. Sealers are utilized to protect the paint job by sealing the substrate and preventing moisture and contaminants from penetrating.

These coats play a pivotal role before applying the final layers of paint, ensuring that the surface is prepared properly to maximize the effectiveness and appearance of the top coats. In contrast, the other options listed encompass different categories of coatings, such as decorative or protective layers, which are not foundational in the same way that primers and sealers are. Understanding the function of these coats helps highlight their importance in the overall painting and refinishing process.