IMO Eternabond tape is the right thing to use over any seam, after scraping off the old caulk and wiping with solvent.
Dicor self leveling caulk for any recaulk requirements, after a good wash/scrub/ rinse with a TSP/water solution.
Then 2 coats of white Elastomericroof coating.
Here is a link photos of Steveio and Karen redoing the fiber glass roof of their '96 Safari Serengeti few years ago:
(you must sign in to Yahoo to access that info)
No Yahoo account? email "KarenInTheWoods Karen Pfundtner" <firstname.lastname@example.org>, and ask for roof coating info, (tell her Mel sent you)!
BTW, S&K did my roof just three weeks ago!