Gary, you won’t need to waterproof your feathers unless you plan to hunt in the rain. While some will differ in opinion, I advise to stay away from all moisture-based waterproofers for feathers, from duck oil to silicone. Most mail-order trad archery suppliers sell a white powder, Fletch Dry is one brand, that you rub into the feathers. Unlike the liquids it doesn’t get oily and attract dirt, and it doesn’t make the feathers stiff and loud in flight. Nothing holds up in a prolonged downpour, but we’re usually running for cover then anyhow, not really hunting. If you arrows are properly bare-shaft tuned you can shoot fine with wet flat feathers, though they make a loud “Pop!” sounds on release and you may get a cold water shower in the face. IMHO
