A biodegradable sink paste for leaders and flies. Sinks your leader butnot your dry flies on spring creeks with wary fish. Helps nymphs and wetflies sink faster when going deep. Will not discolor your tippet. Work Snake River Mud onto leader with fingers and watch it break the surface tension. Rinse your fingers off in the water. Go ahead, it's biodegradable. Best for sinking leaders when fishing really spooky fish in still waters.