Are you trying to do a completely original restoration? If not, then I wouldn't be to concerned about where the factory sealed, and just seal every joint in some way or other. I would recommend a good 2 part epoxy based sealer like 3M, SEM, Norton, Evercoat, etc... That is just what I would do. If you can do inside and out, even better. Anything to keep moisture from getting in a joint.
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