Let the area dry completely before you apply any paint or sealer, as you do not want to area to retain any moisture.
You can then cut the top layer of the potato and dip it in soap again to continue rubbing on the area until the rust comes off.
Always wear safety goggles to protect your eyes from the sandpaper. You may also want to wear a protective mask so you do not breath in the sandpaper particles. If the rust does not come off with the sandpaper due to excessive rust build up, you may want to use a drill mount abrasive. You can mount the abrasive onto your drill and drill the surface until the rust comes off.
Though a fixture may be made of materials that are rust-resistant, like aluminum or brass, the screws, bolts, or other fasteners may not be rust-resistant. They can then cause rust to appear. Check the screws and bolts to ensure they are resistant to rust or caulk and seal these open areas.
To get the primer to adhere to the metal more easily, try scuffing the surface lightly with 80-120 grit sandpaper or a wire brush. [7] X Expert Source Patrick CoyePainting Specialist Expert Interview. 22 July 2020.
You can then fill any holes in the painted surface with putty to prevent water from getting into the painted surface. Make sure the painted surface is smooth and rust free before you paint over it.
