Same here. That's the main reason (that, and clearcoat issues) i did a little refinishing on my Blumina:
The rear bumper cover is fairly easy to remove, and exposes all the damage at the joint. I had it on both sides, and a couple spots on the rockers from neglected stone chips. About $150 of paint, catalyst, and urethane clearcoat later (plus some DA discs, masking tape, etc.) and it was back in good condition. I also applied some deflection on the back side of the bumper cover to keep the road spray from the area. Salt is fun, isn't it?