Cap'n Tolley
There's a product which people have said works well with the peculiar name of "Captain Tolley's Creeking Crack Filler" or something close to that. Other than that, you need to groove out the crack and fill with matching gelcoat. If the boat is fairly new, you can get the original gelcoat, or a thicker, easier to use version called gelcoat paste, from the factory. If the boat has discolored from sun exposure over the years, you may need to mix colors to match, and that takes a keen eye for color which eludes me. Email me if you need more specific details. georgek2@earthlink.net
