Ned,
When I bought my boat, the surveyor found some wet core material in the upper deck/roof over the cockpit caused by some leaking roof penetrations.
I hired a fibreglass guy who: cut out the lower fibreglass skin; removed a fairly large area of wet plywood (core); used heaters to dry everything well; installed new plywood using lots of epoxy; applied a new lower fibreglass layer; and applied the gelcoat finish. If the area requiring repair had been much larger, we probably would have done it from above, instead of below as worked well in this case.
I then also rebedded any penetrations such as stanchion bases, and removed the main culprit in this case, a base to support an upper deck dinghy cradle. I now mount my dinghy on the swim grid using a Sea Wise davit.
I am very careful about maintaining good penetration sealing, and have done my best to eliminate and/or minimize any "roof" penetrations.
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Tom
Nanaimo, BC
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