This isn't a reply to Mike's post. My Google/Browser
combo wouldn't 'reply' to earlier posts, for some reason.

Someone else mentioned cross country ski wax.
I used that stuff for years. But then I began to suspsect
I was getting unexplained refusals that didn't make sense.
Then I began to suspect it had a smell the fish don't like.
I can't prove this, but I now believe it to true.
So I don't use ski vax anymo.

I tried using beeswax lip balm out of curiosity once
(it had a mint flavor) and the fish wouldn't go near
nymphs dubbed with with that stuff on it. They'd turn
away from 3 feet off. Smell matters. Or lack thereof.

Actually, when you think about the olfactory bell curve,
anything from the "no smell at all" hump on the curve all
the way to to the tail end of the "smells real good" part
of the distribution would be a good way to make a fly.

The "stinks real bad to the fish" part of the curve is
real bad. I've seen it in action.