The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
Wbranch on Jun 24, 2020June 24th, 2020, 5:09 am EDT
It depends on what the fish are doing if you see head and tail rises it is likely the trout are eating the mayflies as they rise in the water column and they eat them a few inches under the surface. If you see more typical head rises then you can add a little floatant.
Brian314 on Sep 7, 2020September 7th, 2020, 9:45 am EDT
I use that powder floatant on the CDC part of mole flies (a Charlie Craven emerger pattern). The CDC is rather hydrophobic and works well,untreated, at first. But after a while, I find I have to dry the fly and add floatant to the CDC part.
BTW - there's a good tying video on the mole fly at the Orvis nymph-tying page. Brian