Final answer:
To remove repair file marks from an aluminum propeller, clean the propeller, sand down the marks, and polish the surface. Apply the polish or cleaner using a soft cloth and buff the surface in circular motions until the repair marks are no longer visible.
Step-by-step explanation:
To remove repair file marks from an aluminum propeller, you can follow these steps: Start by cleaning the propeller with a mild detergent and water to remove any dirt or debris. Next, use sandpaper or a file with a fine grit to gently sand down the areas with the repair file marks.
Be sure to sand in the direction of the propeller's grain to avoid creating new scratches. After sanding, you can use a polishing compound or aluminum cleaner to restore the propeller's shine. Apply the polish or cleaner using a soft cloth and buff the surface in circular motions until the repair marks are no longer visible.