I was just watching an old fly fishing video produced in the UK in the 90's. It was pretty funny watching these guys land big old trout and then club them with metal clubs and pile then on the bank. Anyhow, one guy was rigging up a dry fly and said the most important thing in fishing dry fly's is put floatant on the fly and a sinking agent on the leader. I had never heard this, and was always taught to dab some gink on the fly and then run my fingers up the leader to float it as well. His rational was that fish see a leader on top of the water and not when it is submerged. Is this a convention I was just never taught? It makes pretty good sense to me, but I have been on guided floats where the guides were putting floatant on the leader like I was taught. Just wondering what others do.