Re: Rear window channel prep
I did a repair like that on the rear window of a '62 Nova. I sand blasted the pits, used rust converter spray, then filled with fiberglass filler. Never showed any problems after 14 years when I sold it. That car used a rubber seal not adhesive sealer. Several years after driving it on the street, I pulled the glass & rubber seal out and bolted in a Plexiglas window to lighten the car for drag racing. All of the paint was good as new under the rubber.
1969 Sport Coupe SS Tribute Cortez Silver 454 400TH