Retention of moisture in that area can make this area worse for wear ( vinyl roof)
That said, you can put " Short strand" fiberglass filler in this area over lead that is still stuck to that seam where the roof overlaps the quarter. If lead has separated, there might be a gap under it and then led has to come off.
I have re leaded these seams and I think there may be a substitute now. If its all stripped in that area, one could weld the panels together to make it less apt to happen. These were panel spotted when new IIRC.
Starting in '73 at this area and bottom of A pillars, and rear tail pan/ bumpah mounting, the amperage of the welds was increased at Fisher Body to help meet the new 5 mph standards.
This is one reason why '72 bodies were crushed and written off after the strike.
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather
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