I have a ches.17lt that has a 6" cracked just behind the forward hatch. I was told I would need to sand to bare wood and apply glass & epoxy. I'm thinking this will show as a light "spot" on a bright finished deck. Can I use a butt block under the deck and just glass over the crack on top? The boat has never been completed and so it is only epoxied now. Any help would be great Thanks.