Just picked up this new old boat. 1992 monark 24ft pontoon. It looks like it's lived its whole life docked in saltwater or brackish water. There is a very good bottom paint on it but it is time to replace it. Once I get all the bottom paint off I would prefer to leave it bare aluminum. I have scratched through some of the coating and the pontoons appear to be in very good condition. I will be using this boat primarily in saltwater. My question is this, do I need sacrificial anodes on the pontoons and if so, what do I need to get?