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Stopping rust along quarter seam - 98 Explorer

Is there any way to slow down or stop the rust in the fender to quarter edge seam without having to tear up the paint?

It looks like from the inside the butyl caulk is in the way of spraying anything in to treat it. Should I dig out the caulk and use POR-15 in there?

There is some rust starting to appear along the rear quarter seam at top of the wheel well. It looks like the seam was puckered and a little salt got in between the quarter panel and the inner fender panels and now it has started to bubble through the paint. In another year it will be a big ugly mess.


I fix dents
Staff member
Elite Explorer
April 16, 2002
Reaction score
City, State
Millersville , Maryland
Year, Model & Trim Level
2000 Explorer Sport
Products like POR-15 will buy you some time but not much.
The best way to stop rust is to completely remove it.