I did what you suggest around my vent, air horns, antenna, etc. If I were to do it again, I would use dicor self leveling to seal around these and eternabond on the flat straight seams. I found it difficult to get a good looking seal around the round items with the tape. But it did stick well.
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--Chuck
95 Newmar Kountry Star, Spartan Chassis, Venice, Fla
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