As a rule, staining of metal structures takes place in several consistent stages, and work should be carried out with thorough observance of all technologies. Before starting painting, you need to carefully prepare the surface of the metal structure. Experts recommend washing it ABD or with special detergents based on alkali and acids. The next step is to clean the surface from rust and old peeling paint. This can be done with a special tool or manually. Before the direct application of the primer, the metal structure is best to degrease. If the new paint is applied on top of the old, then it is recommended to polish the surface. This will provide excellent adhesion and will allow the composition to better connect with the design.