Fortunately I had no rust on the (discarded) ones that came with my 85, but the edge of the rubber seal had worn/eroded the clearcoat off to the point that a complete sanding of all clearoat in that area was required before the repaint.

__________________
86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm