I would use the Dicor 502LSW self-leveling sealant! The 4" EternaBond tape is great for sealing around skylights, powered vents, etc. Be sure to put a bead of the dicor around the edges of the tape after application!
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD