When I was much younger and worked in a factory where they processed aluminum parts, they cleaned castings in acid baths, then used Alodine as a temporary protective coating to slow oxidation until the parts could be painted. The Alodine coating we used only lasted a day or two, and parts that weren't painted within 24 hours had to be returned to be cleaned again and recoated before painting.
Unless the Alodine you are asking about is much different from what we used to use, I would suspect that this product won't last long, if not followed by a more permanent treatment or coating.
By the way, Alodine used to come in colors. I know that it came in "clear"; but we didn't use it, because you couldn't visually tell if the part had been treated. We used "yellow", which was kind of golden in color.