Very much like liquid floatants, aerosol sprays tend to be haphazard in their application. In many ways then they have a similar use, making them perfect where a fly needs a complete coating. Given this, you might well question whether to use a spray, or a liquid. Sprays are invaluable when you’re afloat and the boat is bobbing around, because trying to thread your fly into the narrow bottle neck of a liquid floatant can be challenging now. Conversely, if you’re on an exposed shore in a raging gale, training a jet of spray onto your fly can seem impossible, making liquids your first choice.