Contour filler for profiling irregular shapes to provide contours for subsequent tape wrapping. An integral component of most Denso tape systems for the preparation of surfaces prior to wrapping. Denso Petrolatum Mastic is a filler for profiling around pipe joints, flanges, fittings, nuts, bolts and other irregular shapes to improve contours for subsequent tape wrapping. Ensures intimate contact between Denso tapes and the substrate being protected. It can also be used for sealing cable and pipe entry ducts; temporary plugging of spare ducts and filling electrical glands and junction boxes.