VISBELLA Spray PU Foam is a one component polyurethane foam used to fill gaps & crevices. The foam that dispenses from the aerosol can is moisture cured and draws humidity from the air for cure. PU foam is widely used in sealing around doors, windows, pipes, indoor fittings or any other application in construction. Provides an excellent bond to lumber, plywood, concrete, metal, masonary and other substrates.