[flyingfrizzle]

Ive seen smaller areas like that over the years but not one that large.


That's why I started sealing up the ply 100% prior to installing the core if using wood. Then I use Thickened epoxy to bond it to the old skin. I wouldn't do a new hull that way but the re-dos can get air trapped voids easily. It is important to lay the lower section in first and try to work the air out the top as it lays in. Also having enough resin/ resin soaked cloth there to fill the small voids.