Well I took out all the seats on my Malibu and I tore up all the insulation that's under the rug and I noticed some rusting. It's really only surface rust on the inside because my weatherstripping needs replacing and water leaks in my windows when I don't have it covered. My question is what should I do about this? I'm kinda low on budget so I was thinking maybe sanding it down and priming it as opposed to replacing the floorpans. Any thoughts?