a method for applying a blown polyurethane coating to carpeting or other sheet material . the method includes the step of adding a filler to the polyurethane components to assure that the liquid does not unduly penetrate porous goods . the mixed polyurethane components are then placed in a puddle on the sheet material and leveled to a uniform coating . steam is passed through the sheet material and the coating to initiate the reaction of the components . the steam also adds water to the coating , so the formulation is such that additional water is needed , and the needed water is added by the steaming . after the polyurethane has completed blowing , and before the polyurethane has cured beyond its plastic state , the foam may be compressed to decrease the thickness . a second sheet of material can be placed over the polyurethane to prevent the polyurethane from adhering to the compressing roller .