Lochsa is a premium all-around gel floatant that even works on CDC. It won't mat dry flies made with CDC and is perfect for treating any type of feathers, hair, hackle, or yarn. Lochsa will provide maximum floatation without the slightest hindrance on appearance. It is silicone based, and won't melt in the heat or harden when it's cold.
Prior to first cast, apply desired amount of Lochsa to fly. Use fingers to work Lochsa into hair and hackle. If fly becomes water logged, use powder desiccant to dry, then reapply.