I have a boat in a slip in Salem Mass in the ocean as well as Winni. My ocean boat has bottom paint and is a necessity in the ocean. It's my understanding that bottom paint doesn't actually stop or prevent growth. It is actually sacrificial meaning stuff grows on it like barnacles etc. but the paint comes off easily (power washing etc) thus taking the barnacles with it. I don't put any bottom paint on my fresh water boats. It looks terrible, is very expensive and it can be difficult to cover the entire bottom. As others said I simply have it acid washed at the end of the season for $125 and it looks like new.
Good luck.
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