I use loads of 'Hunts Gel or Gink' on my deer hair flies and find it excellent in all but the warmest of days when it becomes a liquid and doesn't apply to the fly well.
I never do the place a little on your fingers first and apply as it doesn't adhere to the fly as well as simply adding it straight from the bottle directly onto the fly at the point you need it (DHE wing only, Hedgehog all the fly etc.)
CDC flies it's Hunts High and Dry powder and between fish i wash the fly in the water, dry with a paper tissue, then re-apply.
Works for me.
Allan