cap/hull separation

[GroveGuy]

Fellow Seacraft aficionados,

Well it appears that I am having separation between my hull and cap about halfway down the starboard side once again (after having this re-riveted about 2 years ago). Are there any opinions out there on how to fix this correctly once and for all?

rivet and then glass the seam?
rivet and 5200?
any suggestions are appreciated.

BTW, Boat is a '69 SF with no access to gunnels from the inside.

thanks!
GG