wrote in message
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In attempts to find a leak I've spent ages running water on various parts
of my wife's car. I'm now fairly certain that the problem is a short
vertical seam, running from a roof slot to the hatchback opening. It seems
to be a simple overlap with a couple of spot welds - the question is how
to seal it. Is there any body mastic that will wick into a thin gap and
then set? What do the body shops do?

seam sealer did it to my Dacia Duster .......