Just has my wife's 09 mariner fixed. My buddy used POR 15, bedliner, and then paint. It was rusting on the little metal lip under the fender edge on the pass side. I didn't want it creeping around to the body. Has anyone found any way of preventing this? I know the the newer fords don't even have this lip. I'm guessing it's caused by getting chipped by a rock and then starting to rust. I was thinking about coating the edge with black RTV and sliding a piece of rubber edging over it maybe 1 inch wide to protect the paint.
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