I always keep dry fly line with the braided loops on one of my reels, and I made a 20 ft sinking tip by cutting a piece off of my wet line reel and putting loops on both ends. So, when I'm out in a lake on my float tube fishing streamers I can quickly remove the sink tip, re-attach the leader to the dry line, and start fishing dry flies quickly if the rise starts. With smaller fly line (like 3 wt) I use a dab of Loon UV Knot glue on the braided loops, just in case.
DANBOB