Outdoor air conditioner brackets are subject to moisture, ultraviolet light and weight loading. Not all paint can withstand the accumulation of precipitation and possible deformation of the metal. In addition, for such individual parts, you need a compound that is easy to apply quickly by hand. We chose Zincor reinforced zinc primer paint.
It is grey matt with 99.9% zinc powder, also suitable for application on a wet surface. Just what you need for small exterior steelwork. I even did not need to sandblast the surface, the primer adhered to the substrate.
One coat was enough, but the brackets were coated with two coats. The corrosion protection should last at least 10 years. However, if necessary, the coating can be renewed or colored paint can be applied. The primer is compatible with most paints.