All I can say to on the subject of the resin to attach the Coating was that in the TV programme they discussed that U480 had to go in to get it repaired when the Captain bottomed the boat and it moved across the seabed under Ocean currents.
But the guy who survived said the boat Coating was strong after they got there act together in first blasting the hull in dry-dock with metal ball Barings to give a an ultra smooth and clean surface then painted with bonding coat.
But I’ll tell what that was crystal clear that when they dived on the boat the Coating was fantastically intact after being on the sea bed for over 60 years.
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