An experiment for you
On my coupe, the major water incursion was from around the rear windshield gasket.
First, find someone you love and trust. Let them close you into the trunk with a flashlight and run water from a hose around the rear windshield first then the trunk gasket. I'll bet you find water coming in the upper left corner.
Now the bad news. In my case and probably yours, no amount of squirted-in sealer will result in a satisfactory repair. Upon removing the rear windshield and gasket you will probably find the gasket channel rusted through in a number of places. The better news is that this is not a complicated or especially expensive repair for a competent body shop. Body work cost me about $200. plus gasket (expensive for a coupe, much less for a sedan). I also invested $100 for a glass shop to R&R the rear windshield since I was afraid to crack it and coupe rear windshields are made of unobtainium.
Let us know how you do.
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