Bob May wrote:
Float the boat in the acid and provide the current to drive the copper atoms
to the boat and you can do it. The rest is time for how thick you want the
copper coating to be.
I'll note that it won't be cheap to float the boat nor the amount of power
that you'll be needing to provide for the plating.



Not a good idea. As the copper is slowly consumed (rusts), a portion of the
effluent would be Cupric Chloride and/or Copper Sulphate, which are extremely
toxic to living organisms.

Do they make a marine wax/applicant for this purpose?