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sure, but as you say, once bonded - imperfectly bonded - you create a circuit which will almost certainly have different voltage potential between elements. if the connection is perfect you have essentially one piece of metal, but maintaining that perfect connection is almost impossible.
the biggest determinant of the need for bonding thru-hulls is if corrosion is apparent. my raw water input thru-hull has never needed bonding and i suspect that the pencil anode in the heat exchanger takes care of it.
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red peril
severodvinsk class russian submarine
1993
364 feet
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our life afloat:
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