A project manager who designs a steel construction for a long duration takes into account, in his choice between steel and concrete particularly, the durability and maintenance programme of each component. The metal + paint route is thus very often the most competitive thanks to the painting industry. This industry has been reorganized with objectives of quality and high durability, by the creation of ACQPA which manages the performance certificate of paint systems, painting operators, inspectors. OHGPI, by examining the H form summarizing all the parameters of each project, approves the guarantees of performance and durability. A profession perfectly controlled during the whole life time of the steel construction. Look at the Eiffel Tower!