Automotive primer is a preparatory coating applied to vehicle surfaces before painting to promote adhesion, improve paint durability, and protect against corrosion. It helps fill minor imperfections, creating a smooth, even base for the topcoat. Available in various types—such as epoxy, etch, acrylic and high-build—primers are selected based on the surface material and repair needs. Using a quality automotive primer is essential for achieving a professional, long-lasting paint finish.