The iron or steel surface to be painted should be free from rust, grease, dirt, etc. Suitable tools like wire brushes and scrapers are used to remove all loose scales, marks etc. from the surface. Caustic soda or lime water is used to remove grease. The cleaned surface is provided with a film of phosphoric acid. This film protects the surface from rust and also facilitates the adhesion of the paint. Then coats of paint are applied. A paint suitable for iron and steel surfaces should be selected for each coat. The priming coat or first coat is made by dissolving fine red lead powder in boiled linseed oil. After this coat has dried, two or more coats of the desired paint are applied with a brush or spray gun over the priming coat, the finishing coat should have a smooth finish and care should be taken to avoid brush marks. Should. on the surface of the final paint.\
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