Repairing a Bondo repair

There’s a lot more rust there than you think. That picture of the underside clearly shows bondo coming through holes in the metal. And that picture is showing the base of the C pillar at the very end, which is part of the quarter. So you have two panels involved in multiple places.

The other concern is the sound deadening material on the quarter. It looks brand new. So it very well could be hiding even more shoddy work.

I tend to be a bit of a pessimist, but my bet would be there are spots all over that car that have to be repaired. I had a similar issue show up on my Challenger at the roof seam, some moron filled it with bondo. When I tore into it I discovered both quarters had been very poorly repaired. It needs new quarters and a roof skin.