mr.b wrote:

Has anyone ever heard of this procedure being done from the interior
rather than the exterior of the boat?

I can't imagine any other way to do it. Making the non-skid part of the
deck and other areas look right after re-coring would be near impossible.
Doing it from the inside requires removing all or most of the interior and
working with fibreglass over your head which is why extensive deck core rot
is an economic death sentence for most boats.


Also, can anyone give a ballpark estimate as to the expected cost of
loosening the lead ballast on a fin-keel and re-sealing/repairing the
joint between the two?

If you have to ask, you can't aff....

Too many variables such as how frozen the bolts and nuts are. You would
need to talk to someone who had done it on a similar make, model, and age.

--
Roger Long