It all will depend on the affliction of the siding. If you're modifying colours, or if you already comprehend it will acquire 2 coats, employing a primer would not be a bad thought. The chalk that coated the aged aluminum siding posed the biggest impediment for this project. In case http://mariopolhd.blogprodesign.com/12547644/how-to-prep-aluminum-siding-to-paint-an-overview