Enamel suitable for the painting systems of various structures, water-impermeable, easy to apply, ideal for professional use as it is extremely compatible and has excellent adhesion properties, filling and covering powers on various types of substrate. It guarantees an extremely uniform finish with extraordinary resistance to atmospheric agents and mechanical stress, elements indispensable for the duration of the applications, and useful for protecting the structure over time. Thanks to its high quality, effective aesthetic and technical solutions can be obtained for various painting requirements offering excellent finishing results with maximum protection and colour resistance in exterior environments, even in severe exposure conditions. The properties of this film which include elasticity, scratch resistance and wear resistance, ensure that it maintains its appearance while remaining stable and able also to withstand the stress created by the dimensional variations of the substrate in response to the varying of climatic conditions. It is formulated with photostable colouring pigments and modified synthetic alkyd resins in the solvent phase; the dried film has particularly good adhesion and creates a protective water-impermeable barrier so as to provide high protection in external environments highly exposed to atmospheric agents and sunlight; it is ideal for painting systems designed for both interior and exterior structures. Its good coverage, low tendency to run and rapid drying properties mean that it can be applied with professional tools which guarantee a finish characterized by visual consistency, uniform thickness and good coating of the corners as well as rapid painting times.