Aluminium components of the awning frame are pretreated before the actual powder coating. According to the current state of the art, this pre-treatment process represents a significant improvement against hairline corrosion of the frame colour. In summary, this process is described in the RAL-RG 631 and RAL-GZ 663 quality and test regulations for piece coating of aluminium and steel components and in the Qualicoat regulations. On request, markilux awnings with this coating with pre-anodisation are available as custom-made products in accordance with RAL RG 631 and GZ 663. General information on the care of coated awning parts: At locations with high emission values or climatically aggressive factors, the surface must be carefully cleaned of the "catalysers" of filiform corrosion formation (so-called starter salts, especially chlorides) at short intervals, depending on the degree.