I haven't tried Fanny on nymphs, but have used a different
dessicant/floatant combo whose name escapes me ... with good results

My only use was with a Bird's Nest, shaken in the stuff, and then sunk via
split shot on the Truckee River .... I caught fish .... which ones wouldn't
have eaten just the Bird's Nest untreated, or how many pointed and laughed
at the treated fly and let it drift on by, I don't know G