"Never use any rubberized/silicone sealer."

woops. It didn't work in the first place, but I tried using silicone adhesive on the area where the water pools on the lower rear window seals. After finding it didn't help at all, I cleaned it off.

I too am trying to fix the rear window seal leak.
I have some rust under that window where the water pools. It's difficult to get at, but once I have the leak solved, it will get and blasted? or somehow cleaned out and zapped with POR-15. Difficult to see, but if you reach into the holes under window behind the trunk lid, you can FEEL the rust forming where the paint gave up.