Foams and Sealants Sealant Foam Seal, fill, caulk and insulate with this one-component urethane foam.
Foam expands and moisture cures to form a semi-rigid closed cell mass.
Fills large voids in damaged areas before the fiberglass work is done. Reduces sound penetration. Two Part Pour Foam Fill boat cavities, pontoons and floating dock blocks. Make your own buoy markers. Sets in place in less than 10 minutes.