Is TotalBoat Seal a silicone, polyurethane, or polysulfide sealant? Eric Boudreau April 01, 2022 14:55 Updated TotalBoat Seal is made up of an elastomeric material, which means it is a synthetic rubber. This allows it to work as an excellent sealant, with good adhesive properties and bond strength. Related articles What can TotalBoat Seal be used for? What is the cure time for TotalBoat Seal elastomeric sealant? Caulking and Marine Sealant Coverage Chart How long is the shelf life for TotalBoat Seal? Can TotalBoat FlexEpox be applied over polyurethane paint? Comments 0 comments Article is closed for comments.