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zincs are used to fight electrolosis. any time you have metals in contact with water, electrolosis will happen. its likd of like rust. the zincs are a sacrificial lamb so to speak and will absorb the electrical currents and disolve away slowly. If you didnt have the zincs, your softer metals like aluminum outbaord parts would start to disolve..
if your going to use your boat all the time, you can probably get away with not painting it for a season. You might have to pull the boat on your trailer and pressure wash any growth off ever month. I wouldnt be scared of soft green growth, its the barnacles that will get you...
all of my boat knowlege comes from my upbringing on sailboats, but its the same with small motor boats.
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