Abstract: A porous fluoroethylene resin coating on a substrate is obtained by coating a substrate with an aqueous dispersion paint comprising a particulate fluoroethylene resin, inorganic water-insoluble powder and an aqueous medium, drying the coated paint, and heating the coated surface to a temperature of not lower than the melting point of the resin. In another embodiment, a fluoroethylene resin powder is further applied onto the above-mentioned baked coating when the coating is in a molten state, followed by heating the resin powder to a temperature of not lower than the melting point thereof to obtain an anti-corrosive surface coating.