I had to remove the trim and seal the windshield myself because the local glass installers I talked to didn't want to risk scratching the paint. It's a very messy job but well worth it. You have to keep checking for leaks and keep filling the openings until the leaks stopped. One installer told me I could try removing the inside trim and putting compound under the seal but I found that very hard to do and it didn't stop the leaks.
The guy in this video was able to stop a rear windshield leak without removing the trim . He used a product called Transtar 4167 https://www.tat-co.com/TranstarAuto...ish Datasheets/transtar_tds_4157.pdf?ext=.pdf.
