The smeared sizing DMD is an insulating material that coats the special modified epoxy resin on the DMD in a stagnation manner. Widely used in interlayer insulation and tantalum insulation of oil-immersed power transformers. In use, the coating begins to melt at a certain temperature during the drying of the coil, resulting in adhesion. Curing begins again as the temperature rises, allowing adjacent layers of the winding to be reliably bonded into a fixed unit. The adhesive strength of the epoxy resin is sufficient to prevent the displacement of the layers of the winding during the short circuit, thereby ensuring the long-term mechanical and electrical properties of the insulating structure.