How can shallow scratches in sheet metal be repaired effectively?

Burnishing is an effective repair method for shallow scratches in sheet metal because it involves using a hard tool or implement to smooth the surface of the metal. This process compresses the surface layers of the metal, which can close up scratches and restore a uniform appearance. The burnishing action also enhances the surface finish, making it shine and appear more polished.

While sanding can remove material to eliminate scratches, it often leaves a rough surface that may require additional finishing steps. Painting can cover scratches but does not actually repair the surface, and if the scratches are deep, paint may not adhere properly. Polishing can improve the overall surface finish but may not effectively fill in or reduce the appearance of scratches as burnishing does. Therefore, burnishing is the superior choice for effectively repairing shallow scratches in sheet metal.