Roofing bars are anodized. This means that a protective coating is applied to their aluminium parts. Anodizing is permanent finish, that will protect the roofing bar from corrosion throughout its life.
Keep your roofing bar clean and dry by wiping it with a cloth after every use, and storing it indoors, preferably in a toolbox. Remember to only use your roofing bar to place battens, as per the manufacturer’s instructions, to ensure it will last for many years.