The boat I purchased was used in salt water around Long Beach. I believe it was pulled from the water after each use and parked on it's trailer at the Yacht club. The bottom is painted blue and that has all but completely chipped off. Under the blue paint is a silver finish which i'm not sure what it's composition is, paint or gelcoat. I will be using the boat in fresh water invironment only from this point on. What would be my best course of action to prepare the bottom for sailing. Thanks