Just giving one of the older canoes in the fleet a face lift. This canoe occasionally spends about a week in the water. As a result the topside paint below the waterline is cracked and crazed. I’ve sanded that off and was planning on using shellac below the waterline. As an alternative I’m wondering about using a bottom paint like Kirby’s bottom paint or Hydrocoat instead. I understand these are relatively soft abraidable finishes that would require periodic renewal, but the same is true of shellac. Anyone have any experience with these coatings or recommendations?