Background
The aluminum sheet bed walls — including the tailgate inner wall — can be finished a number of ways.
First, the walls can be left “natural”. The disadvantage is that aluminum will oxidize over time, especially when exposed to the elements, leaving a blemished appearance. Even polishing aluminum is only temporary unless clear coat is applied immediately afterwards.
A second option is anodizing. This chemical process bonds to the metal surface for a very durable coating. A “clear” anodize treatment depends on the alloy chemistry, ranging from gray to a more brownish tint. Also, different lots can have slightly different tints.
For a more uniform color (or something different than some shade of gray), a dye can be used in a variety of colors. However, this dye process is sensitive to UV radiation so clear coating afterwards is highly recommended. A disadvantage is that scratches are difficult to repair, especially with a clear coat applied over the anodized surface.
