I agree that the CDC quality makes a difference and I have to say that Lucians' stuff is exceptional, I use it for all surface
Fae Lucian's site on his top grade duck bum:
"Top Grade CDC feathers in natural colors is our best selling product, very much appreciated by all fly tiers.
CDC known also as Cul de Canard are collected around the oil gland of the duck ( wild or domestic bird ).
It does not mean that oily aspect is the main factor of floatability.The first reason these feathers float, is their special structure, the multitude of fibers and ramifications.You don't need chemical substances to improve floatability – the best you can do is to dry the CDC fly with an AMADOU patch."
Bearing in mind that Frogs Fanny
dries the fly......"The Defence Rests Mullurd" (or should that be Mallard ?)
Rt Hon QC Lord Lafferty Chumley
PS his CDC does look good. I use JT's and yes it has made me a bigger twit.