If the aluminum framed ports have the frames screwed or bolted to the boat, then sure, butyl tape is perfect... Plastic frameless port lights should be adhered using Dow 795 structural silicone adhesive.
Stuff under the water line, through-hulls near the water line, and anything that may be exposed to significant amounts of fuel, like the diesel deck fill, should also not be bedded using Butyl, since butyl dissolves in petroleum products.
So butyl tape for deck hardware, tracks, chain plates, cleats, clutches etc.
What would you not use it for.
Hull, deck is 5200, you want to super glue effect right.
What about aluminum framed port lights?
Plastic frame less port lights?
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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