Why does the dent still appear uneven after repair?

[AmeliaFitz]

The reason why the dent still appears uneven after repair is that the filler was not sanded smooth. The methods for repairing dents are: 1. Continuously pour hot water on the car body to soften the material and push it outward; 2. Use a soft suction cup to adhere to the dent and pull it outward. The methods for repairing scratches on the car body are: 1. Wipe the scratched area in a straight line with a compound and then wax it; 2. Apply toothpaste lightly to the scratch and wipe it counterclockwise with a cloth several times; 3. Wash and dry the vehicle, then apply rust remover to the scratched area. The methods for maintaining the car body are: 1. Wash the car after the engine has cooled down; 2. Reduce exposure to direct sunlight; 3. Clean stains on the car body promptly; 4. Rinse with clean water after rain to avoid acid rain corrosion; 5. Apply wax or glaze coating.

[DiBlakely]

Having worked in the auto repair industry for over 20 years, there are several reasons why dents may still appear uneven after repair. The improper selection of repair tools is a major issue—for instance, using only a hammer without professional pullers or suction cups results in uneven force distribution, causing partial restoration of the metal surface, especially on thicker areas like the underbody. Another factor is the repair technique: uneven pressure or working too quickly can leave residual metal fatigue, leading to rebound and small pits. Additionally, modern car body materials, such as elastic steel sheets, require preheating before straightening; otherwise, cold working (especially in winter) increases deformation rebound. It’s advisable to choose certified shops that follow standard procedures: preheating the metal, applying even force, and post-repair sanding and inspection to ensure a one-time fix. Avoiding collisions in daily use can also minimize such issues.

[VanArthur]

I just had my car door dent repaired last week, but upon closer inspection after picking up the car, I noticed there was still a small dimple left. Based on my personal experience, the main issue was insufficient repair work—the technician might have lacked skill or been careless, not applying force precisely at the center of the dent and only addressing the outer area. Car body metal has elasticity; too light pressure won’t flatten it, while too much can worsen the deformation. Another factor is the material itself. My car has an aluminum body, which is harder to repair thoroughly compared to steel bodies, requiring special tools and techniques. Additionally, inadequate sanding and polishing post-repair left rough edges more visible. When choosing a repair shop, check their qualifications—don’t just go for cheap small shops. Professional shops test the repair results to ensure success in one go. While this issue doesn’t affect driving, it impacts appearance, so addressing it early saves hassle.

[DiKatherine]

When it comes to uneven surfaces after dent repair, I believe the body material is a key factor. Different vehicles have varying sheet metal materials—ordinary steel plates are relatively easier to repair, but high-temperature alloys or composite materials have stronger elasticity, causing more rebound during repair and resulting in an uneven surface. Additionally, the operating environment matters. If repairs are done in humid weather, moisture seeping into metal gaps can cause shrinkage and deformation after drying, making the repaired area appear bumpy. Unclean tools leaving behind dust or grease can also weaken adhesion. From a safety perspective, this condition compromises the body's structural integrity and increases rust risks. It’s advisable to choose a professional shop that matches the material and observe the repair for a few days afterward. During maintenance, avoid impacts or heavy pressure on the body to ensure durability.