I vote for butyl tape. I am currently re-arranging my lines to lead aft to the cockpit. Butyl tape seals instantly and there is no curing time. I am going to use it on my new hatch install next week.
Good luck, montenido
Odyssey, '79 CSY 44 Cutter
Channel Islands, CA
"There is no unhappiness like the misery of sighting land (and work) again after a cheerful, careless voyage."