Does a white car showing black indicate exposed primer?
3 Answers
If a white car shows black, it is highly likely that the primer is exposed, and the car paint needs to be replaced promptly. Below is a detailed introduction to automotive paint: Overview: The primary function of automotive paint is to protect the car body from corrosion. Additionally, automotive paint enhances the aesthetic appeal of the vehicle. Automotive paint is a type of coating. The purpose of a spray booth is to provide a clean, safe, and well-lit painting environment for automotive coating operations, ensuring that the spraying process is free from dust interference and guarantees paint quality. Composition: Automotive paint mainly consists of resin, pigments, additives, fillers, curing agents, solvents, etc. Metallic automotive paint typically includes reflective metal flakes (aluminum powder), while pearlescent paint usually contains mica particles.
I've repaired countless cars in my lifetime. When small black dots or scratches appear on white car paint, there's an 80% chance it's the primer showing through. A car body consists of several layers from inside out: the innermost is the metal frame (usually dark gray or blackish), followed by the primer coat (typically gray-white for rust prevention), the colored paint layer, and the clear protective topcoat. If black is exposed, it either means the color coat is completely worn through to reveal the primer, or the metal itself has rusted and turned black – both indicating serious damage. If not addressed promptly, moisture infiltration will cause the rust to spread, making repairs more expensive. Avoid using stiff brushes when washing your car. Use touch-up paint for minor damage immediately, and seek professional repainting for major damage. Prevention is better than cure – routine maintenance is most important.
As a seasoned driver, I often discuss paint issues in car enthusiast groups. Black spots or scratches appearing on a white car are definitely signs of exposed underlying layers. In the structure of automotive paint, beneath the topcoat lies the primer or metal substrate, and the black color is mostly due to rusted metal or aged primer discoloration. This indicates a high risk of deep paint damage, and leaving it unattended can lead to corrosion or even perforation. For minor scratches, try rubbing with car wax to assess the depth; if it feels rough and catches your fingers, it means the primer is damaged and requires repair. Regular waxing for protection can extend the paint's lifespan and reduce such troubles.
