Hail2Ale

Trying to do the bare steel look I don't give a shit about a little bit of surface rust.

Friday2322

I'm curious about this one. I think it might look cool. I have a buddy that brought up doing that and clear coating the bare steel. If you do it post some pics.

ShutterBug

Wait for a little surface rust, then clear coat them. Give them that "lived in" look.

SPRSLO

I've seen both untouched and clear coated over with some character. I'd say with clear coat looks better and holds that character in. The bumpers I saw left to their own device just looked bad. Like you were too broke to complete the ownership of bumpers or lazy to put a spray can to it.

Trail Jeeps

I wouldn't do that. While surface rust is cool, Colorado has winters, especially combined with road salt. Things could get out of hand real quick once that crap gets into the welds.

As a previous poster mentioned, at least rattle can them.