I suppose this reply is too late, but I haven't been following the forum for a while.
I have exactly the same condition on my 1979 17' CC Super Sport. I never noticed it until after hauling it from Michigan to Minnesota two years ago. When the sun got low it was very obvious. Hard to believe I had not seen it before. Just looks like bad fiberglass work. The gel coat seems fine and there is no evidence of repairs. The strange thing is that my boat was made at the Holland plant.
I like the boat enough that it can be overlooked.
