We manufacture electrical insulators and other electrical equipment from a polymer ceramic material consisting of 87% silica in various grain sizes for compaction, and a methyl methacrylate monomer. The material is not fired, but cures (20 minutes) at room temperature through a chemical reaction. During the chemical reaction, tiny pinholes appear in the surface of the material. They are so small it is hard to see them, but when we coat the material with a fluorourethane coating, the pinholes become very visible. We have tried to fill them with a paste material before painting them, but this procedure is less than successful. It does not fill the holes as the paste material either does not enter the tiny pinholes and the air pressure in the holes just pushes the material back out. When we apply the fluorourethane coating by spray gun, the pin holes appear to be even larger than they were originally. Even the second coat has pinholes in it.