Will Small Scratches on the Car Body That Expose the Primer Rust?

[DelaneyRose]

Generally, any scratch on a car has the potential to rust, and if the primer is damaged, the likelihood and speed of rusting will increase further. Here is some additional information: 1. Car paint typically consists of four layers, from the inside out: the electrophoretic layer (primer), the middle coat, the color coat, and the clear coat. The so-called "primer" is actually a protective film applied to the metal body through an electrophoretic chemical process, primarily to enhance the body's corrosion resistance. Typically, white cars have black or gray primer, while dark-colored cars have the opposite. 2. The middle coat is sandwiched between the primer and the color coat, serving to bond them together, ensuring the color coat adheres more uniformly and firmly to the surface, enhancing the paint's fullness. The color coat is the layer that gives the car its visible color. The clear coat is transparent and colorless, serving to increase the paint's glossiness and protect the color coat from scratches. There are two types of color coat processes: 1k and 2k. The 2k process includes a built-in protective layer, eliminating the need for a clear coat.

[MacEdward]

If small scratches on the car body expose the primer, rusting is indeed possible because the primer acts like a protective layer for the metal. Once it's scratched, the metal is directly exposed to air. Especially in humid weather or rainy conditions, moisture and oxygen can easily react with the iron, gradually forming rust spots. I've seen many cars where a small white spot initially turns into a patch of rust within months, and in severe cases, it can even cause the paint to peel. If not treated promptly, deep rust can affect the structural strength of the car body, particularly in thinner areas like around the doors or wheel hubs, potentially leading to perforation. I recommend car owners not to wait—once they notice scratches exposing the primer, they should clean them with rust remover paste, then apply touch-up paint or visit a professional shop for a respray. During each car wash, it's good practice to inspect the body and dry any moisture with a soft cloth, which significantly reduces the risk of rust. Keeping the car clean and dry is key—don’t let a small issue turn into a big problem.

[AnnaLynn]

Minor scratches exposing the primer will definitely lead to rust, as the exposed metal will corrode quickly. This isn't just a cosmetic issue—deep rust can cause safety hazards, such as weakening the chassis or frame's structural integrity, leading to unstable driving. I've encountered similar cases before where owners ignored small scratches, only to end up needing entire panel replacements due to severe rust, multiplying repair costs several times over. To save money and hassle, it's advisable to develop a habit of checking scratch areas during monthly car washes. If roughness or white spots are detected, take immediate action. Simple DIY methods include gently sanding the area, applying a rust-proof primer, and then a color-matched spray paint. Be especially cautious during rainy days to prevent prolonged water exposure. Early detection and repair ensure your car remains safe and durable.

[McCourtney]

Small scratches on the car body that expose the primer will definitely cause rust, as the metal surface begins to oxidize once exposed. As an experienced driver, I often see this situation: after washing the car, small scratches are ignored, and within half a year, rust spots appear. Don't worry, prevention isn't difficult. Regular waxing can create a protective layer, reducing moisture penetration. If a scratch occurs, immediately clean it with a damp cloth and then touch it up with a paint pen. If rust has already appeared, simply apply a rust remover. The key is to take action without delay, otherwise, the rust will spread and require costly repairs. Simple maintenance can extend the car's lifespan.