Never Sink CDC & Dry Fly Grease is a superb grease to impregnate any dry fly with or without CDC. It retains its consistence even in hot, sunny days. Put a small amount between your thumb and forefinger, and work gently into the hackle, body and wing. Together with TMCs Dry Shake and Harelines floatant, you have everythig you need to succeed on the water!.