Watch and learn more about how a composite application of polyurea and Kevlar sheet prevent this concrete block wall from explosion and total devastation. The 250 LB blast of TNT was big enough to simulate an average car bomb. The left side of the wall was left as built for the control wall. The right side coated with polyurea. Profoam is Atlanta Georgia's number one supplier of Polyurea Coatings and Polyurea Linings.