Will a New Car Door Rust After Sheet Metal Repainting?

[VonTimothy]

New car doors will not rust after sheet metal repainting if the process is done properly. Below is additional information: 1. Definition of Automotive Sheet Metal: Automotive sheet metal refers to a repair method in car maintenance, also known as cold working. If the vehicle's exterior is damaged or deformed, sheet metal repair is required. 2. Automotive Collision Repair: Automotive collision repair has evolved from the primitive 'hammering, pulling, welding, and patching' to a secondary manufacturing and assembly process for the vehicle body. Repairing collision-damaged vehicles is no longer just about hammering sheet metal; the quality of repair cannot be judged solely by visually inspecting the vehicle's appearance and gaps. Repair technicians must not only understand the vehicle's technical parameters and dimensions but also master the characteristics of the body materials, the transmission of force characteristics, the deformation trends and stress points of the body, as well as the body's manufacturing processes such as welding techniques.

[MacLorenzo]

Will the car door rust after painting? Let me share a lesson from personal experience. Last month, I had my new car's door panel repaired and repainted at a small shop to save money, but within just a few weeks, I noticed several rust spots appearing in the corners. The reason is that if the painting process is done poorly—such as not thoroughly cleaning the underlying metal or leaving impurities—the new paint won't adhere properly, allowing moisture to seep in and corrode the metal. Applying a rust-proof primer is crucial, but small shops might skip this step and directly apply the topcoat, neglecting the anti-rust layer. Additionally, if the paint isn't fully dried or has air bubbles, it can leave hidden risks. To prevent rust, it's essential to choose a reputable shop or a 4S store and pay attention to the process details, such as checking the sanding steps, the application of the rust-proof base coat, and the baking time. This affects the car's lifespan, so don't regret it like I did. Regularly inspecting the door's drainage holes to avoid blockages can also help prevent rust issues.

[AshlynRose]

Rust issues after painting are indeed common, especially for new cars which require extra attention. As someone who frequently deals with such tasks, I emphasize that metal surface treatment cannot be taken lightly. Before painting, it's essential to thoroughly sand off old paint and rust, then apply anti-rust primer and sealant, followed by the topcoat. Skipping these steps due to laziness can allow moisture or dirt to seep into gaps, leading to rust spots within months. Post-painting, ensure even baking temperature to prevent bubbling or cracking in the paint layer. I recommend using high-quality epoxy resin primer to enhance rust resistance. For daily maintenance, promptly dry door seams after rain to minimize moisture accumulation. Choosing a reputable repair shop significantly reduces risks, as factory paint on new cars offers strong protection, but negligence during repairs can easily cause issues. Additionally, avoid parking outdoors in coastal or humid areas whenever possible.

[DiStephanie]

When I see a new car door being repainted, I immediately worry about the potential for rust. If the underlying surface isn't thoroughly cleaned or has residual moisture during the painting process, the new paint can trap oxidation inside, causing the metal to rust gradually. This is especially true for the drainage channels along the bottom edge of the door—improper post-painting treatment can lead to water accumulation and leakage. The key to rust prevention lies in the pretreatment stage, including complete rust removal and applying a primer to seal out air. Uneven paint layers or pinhole gaps after painting can allow rust to spread. Daily cleaning of car doors with a soft cloth helps avoid chemical damage to the paint. Choosing a professional shop that offers rust-proof warranties provides extra peace of mind. Regular waxing can extend the paint's lifespan and block moisture. Paying attention to these details can effectively prevent rust.