Here's a quote from Thwack's post under the mole skin thread.

"I've used it to cover the thread on a bead head between the hackle and the bead. Takes only a tiny tiny amount but it really cleans up the head of the fly."

I'm not against this at all and do that sort of thing myself and think may be it makes the fly look buggy. But I also think a couple or so of neat wraps of the right colored thread behind the bead can look good.

What do you think?