On Jun 16, 8:37?am, Bil wrote:

Magnesium is better than zinc as a sacrificial anode in sweet water.
Your prop manufacturer will be able to advise further.

Cheers

Bil

Did I somehow miss a mention of the boat's hull type? If Al's boat is
a wooden hull, magnesium would be entirely unsuitable regardless of
any fresh water considerations.

As mentioned above, the zinc's are not a good choice in freshwater
cause of the forming of zinc-patina.
Magnesium will probably be gone too fast. Better would be aluminum-
anodes.

Fair winds,
Len.