: What causes this and what is the best way to fix? I know there have
: been discussions on this before. This boat is stored in a barn
: with a cockpit cover on it. It is used primarily in a fresh
: water pond for rolling. The okume was sealed and then the glass
: put on. In the fillet area, the fillet was put on and the glass
: put over it while wet. I looked down into the foot area and
: there are patches there too. It was also painted with urethane
: for protection.

It looks like de-lamination to me. You say it appears as though the epoxy has vanished, from this I think of glass that feels like it has never been wet out. Is this the case or is the glass still hard? I don't know how epoxy could vanish so my vote is for a de-lamination.
Maybe there was a little air left in the fillet lamination that promoted a de-lam, and again with the rest maybe a not so great bond in those areas.

I don't know but am interested in reading this one through

dave g