The adventure of the 125gal tank

So went and picked up my fish from Gold's they all look pretty good, still some signs of ich *uhg* but nothing major I am hoping they will just kick it. Anyway today is sand down the tank stand and repaint it. Nothing great or special, anyone have any good paint suggestion I should use? its just an all metel stand made of that square piping. I want something that is not going to allow the salt to get through and start rusthing the stand.