Hawk used a 4" wide sealant tape (on our conversion) to cover the laps on top (which can't be seen from the ground).
I don't remember the name of the stuff but it conforms to lumps, bumps and irregularities.
It sticks fast, & apparently seals tight - 3 years & no problems. I think it's in the same line as the 3-M VHB used to bond the outer skin to the structure - only better.
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