Why is putty applied to sheet metal?
3 Answers
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.
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.
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.
