A word of caution.  One propeller manufacturer claims to have a special material that resists marine growth if the zincs are removed from the shaft. This may be true, but many of the marine and corrosion experts that we have talked with are leery of removing the zincs from the propeller shaft because something else will become the sacrificial anode in any galvanic reaction occurring along the propeller shaft. The question is how much of which part will be sacrificed and how is the life of that part affected. Most would rather keep the zinc on and know that the zinc will save all the remaining parts. The zinc is cheap, easy to replace and it will not fail catastrophically. Extra caution and care for boats in slips may be required. There have been reports of accelerated galvanic corrosion caused by stray currents from other boats and harbor wiring. While our props are inherently resistant to galvanic action we still recommend zincs to control galvanic reactions in other parts.

          For control of agressive marine growth we recommend maintaining the prop much the same as you do the hull of the boat. Paint the prop at the same time as the bottom but use a non ablative (hard coating) water based paint on the prop.