I would use Eternabond on all the large openings such as skylights, vents, etc., and Dicor 502LSW self-leveling sealant on small openings such as TV antenna, vent pipes, etc. DO NOT make the mistake of using anything with a silicone base!
Good luck, happy trails, and God bless!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD