Hello Alan,
I got mine (finally) sealed nicely using the non-hardening 3M sealant in the locations suggested by the 1954 Shop Manual (sealant where the glass meets the seal and where the seal meets the pinch weld of the window opening).
The Shop Manual has you put the sealant in the outer channel of the rubber before you try to install the rubber/glass into the opening. You know the glass/rubber is in place when the inside edges of the rubber look right on the inside (carefully pushed in, all the way around the opening - while a person inside is pulling in the rubber, all the way around, inch-by-inch).
The Shop Manual has you seal the glass-to-rubber after the glass/rubber is in position. This probably works fine most of the time (it did not for me). After unsuccessfully following this step in in the Manual, I found the rubber at the outside edge of the glass was not very flexible and I found it hard inject the sealant and hard to get a water-proof seal (at the glass edges) all the way around.
Instead of injecting the glass-to-rubber sealant after installing the glass/rubber (as described in the Shop Manual), I put the sealant in both sides (channels) of the rubber seal before I put the glass/rubber into the cab-opening (on my third try, using a new rubber). This acted as a lubricant and resulted in a completely sealed window.
The non-hardening 3M sealant cleans up easily, even after a few days.
