After considering pros and cons of powder coating versus anodizing, we chose to anodize RoofEdge.  Powder-coated finishes offer flexibility in color options; however, the durability of the finish can vary greatly.  With some products, we observed loss of paint in as little as two years.
As green roofs are intended to last decades, we need a finish that would last as long.  As anodization is a change to the chemical composition of the aluminum component’s surface, it becomes a permanent feature.  This finish is most suitable for salty environments (such as near ocean spray) and its hardness allows the finish to endure more abuse than a coated product.