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But isn't the bottom line here is water/moisture is somehow getting thru or behind the paint to/thru the metal, and if that is not stopped any repair will only be temporary?




Moisture (rain, washing car) gets there by way of the 1/4 window. It gets past the window sweep and runs down into the 1/4. That's why the factory formed drain openings in the lower 1/4 pinch welds.