What method is typically used for repairing a shallow scratch on an aircraft surface?

Burnishing is the typically used method for repairing a shallow scratch on an aircraft surface. This technique involves rubbing a hard tool or abrasive material against the surface, which helps to smooth out the scratch and restore the integrity of the aircraft's finish. Burnishing is often employed because it can effectively minimize the appearance of shallow scratches without the need for more invasive or time-consuming repairs, such as repainting or replacing the affected area.

While painting can also address the visual aspect of a scratch, it is more suited for deeper scratches where the protective coating has been compromised, requiring the application of new paint to maintain the aircraft's aesthetics and functionality. Buffing may improve the appearance by polishing the surrounding area but is not as directly effective on the scratch itself as burnishing. Sealing typically refers to protecting surfaces or preventing moisture ingress rather than addressing surface imperfections specifically. Thus, burnishing is the preferred method for shallow scratches due to its efficiency and effectiveness in surface restoration.