Mop n Glo seals the roof and stops those ugly white streaks on the sides of the coach. It may yellow slightly but no one looks at the roof of the mh anyway. The yellow will go away just in time for another application.
Self leveling caulk is available at most rv supply stores. Or you can probably order it from some discount supply stores such as PPL motor homes.
See you down the road.
Doc
W5DOK