Two types of finishes are available. The standard is Poly-ex aluminum paint finish and the optional is a polyester powder coat (APRI). The standard finish will work well for units that are not exposed to the elements the majority of the time. Powder coat is highly recommend for the following (and similar) uses: truck bed without a topper, underbody step, battery trays, and any marine (boat) applications. There is an additional charge for the powder coat option. Please add 14 days to the lead time.