The doors on these cars trap LOTS of water. When I open my driver's door after a heavy dew even, a good bit of water runs out. It's a flood after a rain. That's going to be an issue down the road. About the only way to combat it before the onset of rust is to spray oil-based rust-proofing compound inside the doors.
I hope that GM repaints that for you! A less than year old car should not be rusting. Period.
I hope that GM repaints that for you! A less than year old car should not be rusting. Period.