I have just got through polishing the aluminum parts on my Argus C3 restoration and am thinking what would be best to keep it from tarnishing again? Like many cameras the C3 likely did not have any protective coating and was probably not even as polished as I have it now(I do love polishing), but what to put on this bare aluminum? Jay
Use a good quality wax polish. I use a product called 'Renaissance Wax', a product used by museum conservators on all kinds of metal, leather and wooden surfaces. A good wax polish, regularly applied, will help prevent moisture and finger acids attacking the aluminium surface.