I agree...when we had our 850 the rails peeled (most likely like yours are doing). I took them off (pops right off, but be careful not to bend them, they are aluminum), sand plasted all the loose stuff off of them and spray painted them with high temp, matt black paint. They looked like new and lasted fine until we sold the car a few years later. This is a much cheaper option than replacing them. The dealer wants over $100 for each side.
--
1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.