It may just be the friction and sweat from your hands...I have seen in some of my bows they get a smooth polish look where the hand wraps the grip area..Ever notice those door knobs that have a clear coat over brass peel and flake...Our hands have a lot of oils and such in them and it can affect the finish on things...It could be a lot of wax as you mentioned cause I get it everwhere after making my strings...Almost forgot to mention this, When you set a glass of water or some kind of drink on a coffee table you notice it leaves a ring...Some finish's soften with miosture but I would think Black Widow has a tuffer finish... Keefer's <")))><