Can I use TotalBoat Seal below the waterline? Annette DiOrio December 08, 2021 20:02 Updated Yes, you can use our UV-stable, waterproof TotalBoat Seal elastomeric sealant below or above the waterline. Related articles What are the recommended applications for TotalBoat Seal elastomeric sealant? What type of caulk gun do I need to dispense TotalBoat Seal? What type of sealant is TotalBoat Seal? Can I used TotalBoat FixWood epoxy putty to do repairs underwater? Can I apply TotalBoat Gelcoat over cured epoxy? Comments 0 comments Please sign in to leave a comment.