You should refresh your finish when you notice it is getting dull. Many customers do not have this happen for many years, but it depends on the use of the piece as to how long it will be before it needs to be refreshed. For instance, in most common settings, the finish will not need to be refreshed for many years. To bring back your sheen you simply need to add one thin layer of original Odie’s Oil, buff it in, let it set for about 45 minutes, and then buff it off completely.