DIYbanter - View Single Post - How to re-seal a car body seam?

Harry Bloomfield[_3_]

brought next idea :
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?

Capt Tolley's creeping crack cure might be a way forward, it wicks
itself into a narrow gap.