I like the idea! However, I do have a question about sealing the hole in your vessel. Are you planning on the Butyl to prevent water from getting between the layers or are you drilling through solid glass?
If you're drilling through core then I'd consider adding some glass and resin to protect the hole from absorbing moisture. Other than that, it appears that the Butyl will do quite well in your application, and come apart easier that 5200.
Capt. Douglas Abbott
USCG/MCA IV/C.I./M.I. 500-ton Oceans
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