Joined: Sep 2009
Posts: 2,067
Likes: 73
From: USA
Bikes: 84 Pinarello Trevisio, 86 Guerciotti SLX, 96 Specialized Stumpjumper, 2010 Surly Cross Check, 88 Centurion Prestige, 73 Raleigh Sports, GT Force, Bridgestone MB4
I would not leave a steel frame bare. There are clear powder coats.
My GT 6061 I polished and left bare. A quick wipe now and then with carnauba wax keeps it protected and attractive. But that 6061 aluminum is not prone to corrosion, a little inattention and your ferrous frame will be a disaster.