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Henry's Sinket is a wetting agent that is designed to help your nymphs sink faster. Apply it to flies to help them break surface tension and get down into the fish's zone faster. It can also be used to help sink leaders but Loon's Snake River Mud is better on leaders/tippets while Loon's Henry's Sinket is better suited to flies. Try it next time your fishing flies like unweighted scuds or Hare's Ears that sink slowly on their own.