My roof project went like this:
I had noticed water stains along where the wall met the ceiling in my bedroom. Found that I was getting seepage thru the rusted gutter screws on both sides near the rear.
In the spring I applied Eternabond
RSW-4-50 RoofSeal around all penatrations, into both side gutters over the screws, & along front/back cap seams.
Eternabond sealed it up well & was bone dry all season.
In the Fall, all eternabond was scuffed-up & applied rubber glue to tape surface (enhances coating adhesion).
Then redid the entire roof with
Liquid Rubber coating.
Covering all the tape & the original EPDM roof.


The 2nd pic was the day after it was finished.
After a few weeks it bonds with original epdm, the bubbles disappear, & it dries flat like a sheet of rubber.
Very happy with the results!
Should keep my old rig sealed-up for the rest of her life!