I just sealed my windshield and rear window today. The windshield seal was dried up and had scraper damage. It was leaking at high speeds at the top of the windshield. The rear window was leaking water into the trunk. Both leaks were on the inner side of the seals. I taped off the seals from the glass to the trim and put a bead of black RTV all around and then dressed it with my finger tip. After it set up a little, I removed the tape.
I have done this before on old cars and it works good. $5.00 and one hour's work.