What Is the Rust-Like Substance on a Car?

[VanEmery]

Car The rust-like substance on a car is generally caused by damage to the paint from road debris such as stones and sand hitting the surface while driving, which gradually leads to rusting. Here are some additional tips: 1. Use toothpaste: The toothpaste you use daily can also serve as an effective cleaning tool. Apply toothpaste to the rusted area and rub it back and forth. 2. Use wet sandpaper: If the rust spots are not too large and the adhesion is not too strong, you can gently sand the area with wet sandpaper and water. However, if the rust spots are extensive and strongly adhered, not only will wet sandpaper and water be needed to sand the car body, but after sanding, primer or a touch-up paint pen will also be required to repair the sanded area. 3. Visit a car detailing shop or 4S store for cleaning: Some rust stains are very stubborn, and you might worry about damaging the car's surface if you attempt to remove them yourself. In such cases, it is recommended to go to a car detailing shop or 4S store for professional cleaning.

[AbelFitz]

When I see something resembling rust on a car, it's usually genuine rust, formed by the oxidation of metal surfaces exposed to moisture, resulting in reddish-brown spots. This is commonly found on the chassis, particularly around the wheel arches or door edges, as these areas are prone to water accumulation or exposure to de-icing salt. Causes include moisture penetration through scratched paint, corrosion from road salt in winter, or damp parking environments. If not addressed promptly, rust can spread, weakening the car's structure and even causing parts to seize due to rust, increasing repair costs. I recommend regularly inspecting the undercarriage, washing the car after rain, and using rust-proofing sprays for prevention. For DIY solutions, you can sand the rusted areas and apply primer, but for larger areas, it's best to consult a repair shop to avoid safety hazards. Keeping the car dry is crucial; wiping the undercarriage dry after each wash can extend its lifespan.

[LaRowan]

The rust-like substance on cars is mostly rust stains, resulting from metal oxidation reactions, appearing as reddish-brown patches. Commonly found on the chassis, screws, or exhaust pipes, it occurs due to prolonged exposure to rainwater or road salt, triggering chemical reactions. This not only makes the car look unsightly but also causes embarrassment when posting photos on social media. I once had to replace the entire suspension due to rust spreading from the wheel arch. To prevent this, try to avoid parking in puddles and dry the chassis during monthly car washes. If rust is spotted, act promptly—use rust remover for scrubbing or apply DIY anti-rust paint, which is simple and cost-effective. For deep rust, it’s better to visit a repair shop for sanding and treatment to prevent minor issues from escalating. By the way, long-term use of paint protection film or anti-rust wax can save hassle, especially in high-humidity coastal areas where extra caution is needed.

[DelCarlos]

Rust-like substances on cars are typically rust spots, which occur when metal surfaces oxidize, forming brown or reddish-brown deposits. The causes vary, such as accumulated rainwater not drying, scratches from stones damaging the paint, or residual de-icing salt in winter. Common locations include around the wheels or the chassis frame. As a family user, I always check before taking my kids out, fearing that rust might weaken the car body and affect safety. If found, it should be cleaned promptly to prevent spreading: small areas can be treated with sandpaper and rust-proof paint by yourself, or left to professionals for repair. Regular car washing and keeping the garage dry can prevent rust, as repairs after rusting are costly and compromise both aesthetics and durability.