Multipurpose/Construction Spray Foam Sealant, 12 oz, Aerosol Can, BeigeMfr #: 4293 04 The genuine Nu Calgon 4293 04 is a 12 oz. Can of Nu Foam Expanding and Insulating Sealant and is considered a double expansion polyurethane foam. Nu Foam Expanding and Insulating Sealant contains 469 linear ft. of a 3 8 bead. The Nu Calgon 4293 04 insulates against heat loss and heat gain and is tack free in 30 minutes and dries in 4 hours. Nu Calgon Nu Foam Expanding and Insulating Sealant is fire retardant, UL classified, and contains