I'm in the midst of a frame rust campaign right now. I've got frame #3 in the bath, and have 3 more to go. First two were both full chrome bikes. On one, the chrome is gone (along with the rust) in the BB area. Been thinking about touching up the area with chrome model paint. Sure, it will look like touch up,but the area is mostly obscured by the FD and crankset, and I will disclose fully to the next owner. If I leave it unprotected, rust will return (bare metal).