Give temporary protection to areas of bare metal since bare metal surfaces are usually satisfactory for an electrical bond. If there is corrosion on the surfaces, it will cause severe problems.

AA. Give long term protection to areas of bare metal since bare metal surfaces are usually unsatisfactory for an electrical bond. If there is corrosion on the surfaces, it will cause severe problems.

BB. Give temper protection to areas of bare metal since bare metal surfaces are always satisfactory for an electrical bond. If there is corrosion on the surfaces, it will cause severe problems.

CC. Protect the bare metal areas temporarily since this kind of surfaces are usually adequate for an electrical bond. If corrosion happens on the surfaces, it will bring serious problems.