That drawing is interesting. It appears not to distinguish between the hull below the rubrail, and the rubrail. But the rubrail isn't fiberglass, at least I think it's not based on the gouges I see. It does look like thermoplastic though. The sketch does not infer a joint at the bottom of the rubrail, and my finger doesn't find a joint there either. I wonder if they put the rubrail in the mold and fiberglassed to it? Or is it just part of the hull???
