I never skimp when sealing up the hull of my models, I don't think there is overkill when completing that part of the build. I may consider Canopy Glue for my flying bridge glazing on my Brave class rebuild, but would use some form of contact glue ( Evostick or UHU POR ) for superstructure glazing, which can easily be poked through with fingers, but the hull, overkill all the way.