Any Idea what this could be?

[Bob Hunt]

Bob,

That is an awesome demonstration with pictures and language on how to resolve. I feel very confident in this job should I decide to take this boat on. Still considering. Nothing is final. An engine and sails are my biggest projects with everything else just hopefully falling in line in terms of have to fix, should fix, can wait to fix.

Thank you everyone for the comments and advice.

Thanks for the kind words.

If you are planning to fill a hole in the fiberglass hull, particularly if it's below the waterline, than several layers of new laminate should also be applied to the inside surface to cover the hole.

Bob Hunt