A coating solution comprising 0.1 to 35% by weight of an inorganic or organicpolysilazane having repeating units represented by the general formula belowand soluble in a solvent and 0.1 to 10% by weight of catalyst such as 4,4'-trimethylenebis(1-methylpiperidine) based on a pure polysilazane content. Byapplying the coating solution onto the surface of base materials such asmetals, plastics, glass, ceramic, wood, cement, mortar, bricks, etc., a silicacoating strongly adhered to the base materials can be formed excellent incorrosion resistance and anti-scratch properties and simultaneously excellentin characteristics such as abrasion resistant, long-lasting anti-foulingproperties, wetting properties to water, sealing properties, chemicalresistance, oxidation resistance, physical barrier effect, heat resistance,fire resistance and antistatic properties.
