Dave Mac wrote:

Hi I was wondering if anyone knows if you need to have zincs on your
prop shaft in fresh water?The one on mine looks original(20+ years)
and still appears 99% intact.
Thanks Dave


Pure "fresh" water does not conduct, and will not foster
elecrolytic corrosion. Therefore, in theory, you do not need zincs.

All water contains some dissolved salts, and those loose ions do
permit corrosion a slow as you like.

Zincs won't hurt, magnesium is better for fresh water, but if they
don't dissapear, don't replace them.

They won't work at all if they have been painted.

Terry K