RectorSeal Draft-Block (QFS-12) is a 12 oz., 1-component expanding polyurethane foam sealant, dispensing as a bead from an aerosol container to fill voids & cavities on flat/irregular surfaces. When cured it is an odorless and non-corrosive material. Applications: New Construction, Remodeling, Home Insulation, Seals, and Fills Bonds in a multitude of surfaces.