RE: vanes or feathers
I have used Feathers for over 25 years and use nothing on them. I have had it pour down rain and it did not bother arrow flight. They seem to shed the water and regain flight as soon as I release the Arrow. I used vains for the first 4 or 5 years and the feathers seem to have less drag than the vains do. I am no expert so you might want to check with a pro shop and see what they have to say.