[JRTJH]

Butyl tape is relatively cheap. About $4 for a 30' roll of 1/8"x1" tape. If it was me, I'd pull the metal trim that you suspect, inspect the butyl tape that's on it. If there has been a leak, it will show up as water stains/dirty putty tape in the areas where the leak is active. I'd clean the old putty off the trim strip, reapply and reinstall the trim. Let it sit for a day in the sun, then trim any excess butyl tape and apply the ProFlex. I suppose your "one action fix" would work, but essentially it's only a "band aid" being laid over an active leak. It would be a more lasting and more reliable repair to fix the leak and then apply the "top sealant coat" as a "sure thing on top of a sure thing"...