I recently purchased and old 1973 Chrysler Courier as a project boat and am eager to get your advice on how to repair some cosmetic cracks that are on the hull. The boat floats fine and is solid other than some cracks, dings and deep scratches in the fiberglass. There are small cracks like the ones pictured all over the hull. The hull has also faded and lost it's shine and there are some chalky areas. There are also some rust stains and rubber stains from where the bow stop is located that are on the hull. I was told that to fix the deep scratches I would need to add fiberglass to the hull then sand and polish, but how to I repair the small cracks and the stains? Is there something I can use to fill in the small cracks or will I have to sand this down as well? I have tried bleach to see if that removed the rust but it appears to be deep in the glass. See photos I've attached.