I would follow the manual exactly. My guess is that YouTube is unreliable, don't have a manual or can't read it. It is kind of hard to figure out what a,b and c says. But they put the sealant everywhere. The YouTubers may be filtering there more recent era techniques. I did not look at any YouTube on this subject.
Just to be clear about the tape. You put the tape on the inside of cab before removing old rubber to prevent scratching inside. This "locates" the tape right next to the rubber. The odd part is that it seems like, in the sequence, removing that tape is the last thing. It would seem like the additional sealer they tell you to apply would be on top of the tape at that point? On the inside of cab.
I also noticed that they say to install rubber onto glass after applying sealant to cab. I have only done a few TF windshields, I always install the rubber on the glass for a week or two. Tape it on to train it. Preferably in a warm place.
In 1952, I don't know if a "apply a 3/16 bead" means 3/16 wide or tall. If it means wide, how tall would be variable according to how it is dispensed by the user and what kind of tube opening. The reason I mention this is that it has to do with volume. If there is a 3/16 wide bead with no "volume", it won't fill the voids.
Glass cleaner is good. I use it when applying silicone around bathroom shower glass jobs and etc. WARNING!!!! Use only the foam glass cleaner WITHOUT AMMONIA!!!!!!
This includes Windex. I don't know if ammonia affects 3M adhesive.
