Corrosion from fresh water is also a problem, but no where near as severe
as salt water. say 15% or so. In fresh water use magnesium anodes on both
hull and motor. The dis-similar metals of stainless and aluminum will
generate galvanic corrosion when moisture is present. If you have a
stainless prop the problem is worse. Notice I said moisture. It can be from
simple humidity or fog or any other source. The reaction requires very
little water to initialize. It does make for a messy looking boat in a year
or 2. Anodes are cheap protection.
--
Capt. Frank

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"CCred68046" wrote in message
...
Thanks Frank,

Is this just an issue in salt water?
I noticed most of the fasteners on my boat are stainless and it came
that way
from the factory. I only use my boat in fresh water and its on the
trailer 99%
of the time.