We got a new Forester a few months back. What should I protect the roof rails with? 303 Aerospace Protectant or Ultima Tire and Trim Guard Plus or a sealant (Reload)? It seems like it is smooth hard black plastic. Also the black trim is not faded yet, any difference between using 303 or Ultima? Is it the UV rays that causes the trim to fade? 303 claims UV protection of 40 SPF. I don't know how much UV Ultima has or is the SPF thing just a marketing thing?