A thread I noticed over on ROFT...

Get a cork floor tile of the glossy, prefinished variety and hook your
nymphs into it. Sprinkle a goodly amount of the Frog's Fanny, fumed
silica over the flies - by "goodly amount, I mean a good solid dusting,
not an interment in a mound of the stuff. Rub into the fly with a
1/4"-1/2"/10-15mm medium-stiff artist's brush or similar. Carefully
dump the excess into a sheet of paper and use that to return the excess
to the container. Such tile has a few uses around a tying bench, such
as a drying station for painted-head poppers and similar - take the fly
from the vise with hemos and stick into the tile. If you wish to get
fancy, glue the tile to a piece of plywood and put low sides on the
open-faced sandwich.

HTH,
R