Jaybird,
just sanding and then painting will work for a few years, but unless it is done correctly, it will peal off due to lack of adhesion to the gel coat. Remember, the factory was working with new gel coat, so paint adhesion was assured. The aged gel coat, especially the white, may not like to adhere to the paint without a sealer, primer, then single stage paint. If you are going to do this yourself, ask for advice from the paint supplier. The paint codes listed in the rear closet will match very well.