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What happens is any rain water that seeps past the rear window seals runs down the inside fo the quarter. There are a couple of drains stamped into the quarter to allow the water to drain out. But it will wick up in-between the joints where the quarter joins the rocker. Over time it will rust, especially since there is no paint there, just the dipped primer. So to answer your question, yes, you can get rust there. The best way to fix is to remove and patch.



The metal behind there looks structural, is it ok to cut and weld new metal in or should the entire rocker panel be replaced?