What is the Difference Between Automotive Primer and Topcoat?

[CodyLee]

The differences between automotive primer and topcoat are as follows: 1. Different compositions: Primer consists of four components—resin, filler, solvent, and additives; topcoat is composed of three parts—clear coat, color coat, and primer. 2. Different functions: Primer is the first layer of the paint system, used to level the surface, support the topcoat, provide fullness, and reduce costs; topcoat is the final coating layer, applied to increase the number of layers and thickness of the paint film. 3. Different roles: Topcoat offers scratch resistance, gloss hardness, transparency, tactile feel, aging resistance, and yellowing resistance; primer fills the capillary pores in the steel plate, facilitates surface painting, supports the topcoat to ensure it adheres tightly to the car's surface, and helps reduce costs and save energy.