hi everyone i have an 87 19ft larson and on the bottom of the hull there is a "protective coating." the previous owner said he kept the boat in a slip and thats why he put it on there. it sits at about the water line. I see in on sailboats alot. The picture attached isnt my boat but is the same boat and has the same coating on it. What is that coating and where can i get it? Its coming off on mine and id like to redo it.