What is the function of a primer in automotive refinishing?

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Primer provides the foundation for a durable automotive finish. It improves adhesion of the upper coats to the substrate, which is essential for a long-lasting bond between the metal, plastic, or other surfaces and the color and clear coats above. It also protects metal by sealing out moisture and corrosive elements, reducing the risk of rust under the paint. Additionally, primer helps create a uniform surface by filling minor imperfections and providing a consistent base porosity and color for the layers that follow, which leads to a smoother, more even final appearance. Primer types exist to tackle different needs, such as corrosion resistance on bare metal, filling for imperfections, or promoting adhesion on plastics. That’s why primer isn’t about color, isn’t meant to replace the clear coat, and isn’t the step used to remove old paint—the primer comes after proper surface prep to prepare the surface for the rest of the finish system.