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Gudmundur
 
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In article ,
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I bought a new SeaPro with a 200 Yamaha FI in March and keep it on a
trailer in an enclosed storage building. On weekends I launch and
leave it in the water until Sunday. The trim tab is a sacrificial
anode and is deteriorating rapidly - lots of pock marks. I've done
some searches and found sites on what electrolysis is but haven't



If you have a stainless prop you may find a high rate of anode
deterioration. The stainless prop/ aluminum case/ zinc anode
are your source of current flow in brackish or salt water.

Raise the motor.