I decided to pull the top windshield weatherstrip almost all the way out (except where it is pinched behind the R side pillar piece) and found that the frame was also rusted above and between the windshields.
I scraped those areas too, cut and removed the w/s track (it is held on by thick adhesive tape) as far as needed, two coats of POR-15, sealed under the cap with RTV silicone sealant, and reattached the track segments using 3M w/s adhesive (after removing the old adhesive tape). Water test was fine. Cleaned the w/s tracks of sloppy sealant and wiped a little silicone on the back rib of the w/s to ease its insertion into its track.
Then I looked up under the 'hood' and found that the lower edge of the windshield frame was also rusted all the way across.
Based on my experiences, Winnie really needs to get a person who understands exterior coatings on vehicles.
