[header] How to repair minor aircraft skin damage [title] Draw a circle around the damaged area. [title] Drill a pilot hole in the circle so a bigger unibit can easily drill into the aluminum. [title] Using a preferred method cut out the aluminum within the circle drawn around the damage. 
[step] Debur the newly cut hole. [title] Cut out a circular patch from a sheet of aluminum that is the same thickness and the original aircraft skin.