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Sealing rear window trim?

493 Mike

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I have a leak into the trunk of my 65 Coronet sedan. I had the window professionally removed and replaced to allow me to convert rust forming in the depression below the window, under the trim. I used POR15 and top coated with body color. I didn't think the situation through at the time (last fall) or I would have researched solutions then. Does anyone have a proven method for waterproofing this area so water cant enter the trunk? I did seal the screw threads at the time but, that is a crutch. Would spray can foam be a solution? The factory installed foam doesn't seem to do anything for sealing.
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Ideas?
Mike
 
Good, or bad, after dealing with any rust at the bottom, I masked off, and used rattle can rubber undercoating on mine. Just a thin coat. Then, a coat of body paint. All hidden once the trim is in place.
It impressed me, under my 64, where ever undercoating was, good clean metal under it. So, figured why not?
 
Its hidden by trim so I would be VERY generous with brush on seam sealer.
 
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