![]() ![]() The solutions are 40 grams of copper acetate in one liter of water or 13 grams each of copper chloride, copper nitrate, muriatic acid and ammonium chloride in 1 liter of water. That special treatment may be applying different solutions on surface. So, it is difficult to apply paint on it without any special action. In general, Galvanized iron surface does not contain adhesive nature with paint. Oxy acetylene flame is used to burn off the paint surface and then it is scrapped with brushes. Repainting of steel and iron surfaces is as same as new surfaces but cleaning of old paint is most important. Repainting of Old Steel and Iron Surfaces After drying up, smooth finishing coat of desired paint is applied. This should be applied using brush.Īfter that, two or more under coats are applied which consist 3 kg of red lead in 5 liters of boiled linseed oil. Now prime coat is applied which consists 3kg of red lead in 1 liter of boiled linseed oil. stains on surface can be washed with benzene or lime water.īefore applying prime coat, the surface should be treated with phosphoric acid to get better adhesive nature. If there is any rust or scales, should be wiped off using steel brushes etc. Before painting the surface must be cleaned. Painting of iron and steel surfaces will resist the rust formation due to weathering. Before that the surface is rubbed with pumice stone or glass paper and then 2 to 3 coats of paints are applied.
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