What is the purpose of body filler in collision repair?

Body filler is primarily used in collision repair to fill dents, scratches, and imperfections in a vehicle's exterior surface, allowing for a smooth and even foundation before repainting. The goal is to restore the vehicle's aesthetic appearance by creating a level surface that can be sanded and painted over. This process is essential for achieving a professional finish, as any irregularities can be noticeable even after painting.

While body filler can enhance the appearance of the repair work, it does not play a role in matching paint colors, reinforcing the structural integrity of a panel, or acting as a protective coating. Each of these functions is served by different materials and processes in auto body repair. For example, paint matching involves specific techniques and products designed to blend seamlessly with the existing color, structural integrity is typically addressed through metal work or structural adhesives, and protective coatings are specific sealants or paint applications designed to guard against damage and wear.