Why is putty applied to sheet metal?

[HarmonyLee]

Sheet metal requires putty application because: The body panel after sheet metal repair is uneven and needs putty leveling before painting. The functions of automotive paint are: 1. Protect the vehicle from corrosion by various atmospheric agents; 2. Decorate the vehicle; 3. Identify vehicle types; 4. Improve comfort and sealing, preventing vibration-induced noise. Methods for automotive paint maintenance: 1. Regular car washing; 2. Waxing provides oxidation protection, static isolation, enhances paint surface brightness, and separates paint from dust and harmful gases; 3. Crystal coating applies a high-molecular film with hardness and smoothness to the vehicle surface, forming a protective layer; 4. Glaze treatment penetrates the paint to form a mesh protective film, enhancing paint strength.

[StJackson]

After metal sheet repair, applying body filler is necessary because the car body often has dents, scratches, or welded seams, and painting directly would result in uneven and flawed surfaces. As an auto repairer, dealing with these issues is like using putty to fill wall dents—it creates a smooth transition on the surface. It fills all minor imperfections, such as small dents or rust spots, ensuring an even foundation. This way, the paint adheres more uniformly and securely after application, while also preventing moisture penetration that could cause rust. Without body filler, the paint layer is prone to peeling or bubbling, affecting both aesthetics and long-term protection. Modern filler materials have improved, with eco-friendly types drying faster, reducing wait times. Proper sanding before painting is a crucial step.

[DePaislee]

As a car owner, I've experienced sheet metal accident repairs, and the main reason for applying body filler is to restore the car body to like-new condition. After that collision left dents on the body, painting directly without filler would have left very noticeable marks. It fills all uneven areas, creating a smooth, seamless surface so the paint color can be evenly applied for an attractive finish. Key points include: body filler can level out small scratches and rust spots to prevent further corrosion; although it's an extra step, it protects the vehicle's structural integrity, which is crucial for daily driving safety. I recommend having professionals handle this to avoid creating bubbles or uneven surfaces when doing it yourself.

[OVivienne]

From a cost-saving perspective, using body filler for dent repair is an economical and efficient choice. I once had body damage, and applying filler was much cheaper than replacing the entire metal panel. The reason is that after filling the dents and gaps, the paint application becomes smoother and more durable. It repairs minor surface imperfections, ensuring the paint lasts longer without peeling. If left untreated, dents can trap moisture and lead to rust, increasing long-term repair costs. Additionally, the quick drying time of filler reduces labor hours, but be careful not to apply it too thickly to avoid adding weight or cracking. Overall, it saves time and money while maintaining the car's aesthetic value.

[CorbinDella]

From the perspective of vehicle maintenance safety, applying putty in sheet metal work is a necessary protective measure. Minor imperfections on the car body can conceal problem areas, and using putty to fill these gaps prevents rust from spreading, ensuring the integrity of the metal structure. The purpose is to achieve uniform paint adhesion, waterproofing, and corrosion resistance; for example, if rust repairs are done without applying putty, moisture can penetrate and accelerate damage. It is also emphasized that regular inspections of the car body followed by putty application can extend its lifespan and make the paint layer more stable. In terms of safety, this prevents hazards such as paint peeling, which could affect driving. Although this step is tedious, it is crucial.