Brian Sharrock wrote:

Yep! ... My wife was horrified when she opened a small
cubby hole in the boat and discerned the sun through
the hull! Unless the pigment is black, the resin should
be quite translucent.

yes, that's fine for the topsides, but below the waterline (where you
tend to drill holes for water intakes!) sunlight is not going to
penetrate the antifouling. Also, the lay-up is heavier nearer the keel.