Place the fly into the bottle or brush it on the fly then cast the excess powder off and float away.
Terminal Tackle - Floatant
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Great for drying and reconditioning flies. When your dry fly begins to sink, just put it in the dry shake container and shake it. The absorbing powder in the bottle removes the moisture from the fly and coats it with a water resistant material. Your fly will again float like new.
Umpqua Shimazaki Dry Shake
Frog's Fanny Powder Floatant Bottle Brush Trick - Fly Fishing Tips
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