It shouldn't rust in just a few days.
I had a similar incident with one of those dumbass parking lot islands that have curbing all the way around them. I parked next to one and when I got back in I forgot it was there and turned right into it. It ripped my entire side skirt off, and a tiny bit of the metal underneath was damaged. They charged $400 for a new side skirt, painted, and touched up the metal parts so it doesn't rust.