I would use the 4" Eternabond tape on all the larger openings such as skylights, vents, etc., and the Dicor 502LSW self-leveling sealant on the small openings such as vent pipes, TV antenna, etc.
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD