How much zinc is enough?
I have a Freedom 36 on which I have 1" SS shaft protruding about 2.5 Ft out of the hull on which I have put two collar zinc anodes and one on the tip of my MaxProp propeller. Many people in the Marina also hang a clamp on "Grouper" zinc anode due to stray currents causing galvanic corrosion. I an planning on doing that as well, but are two anodes on the shaft and one on the tip of the propeller enough?
I have hauled the boat for painting today and found that my entire shaft was covered with barnacles and small mussels. Is there anything that can be done to prevent that since it is not advisable to paint the shaft with antifouling paint?
Can the shaft be pained with anything to protect it?