XH shellaced my bar tape on both my road and fixed and, well, I wish he hadn't. I often ride the fixed without gloves, and the shellac is slippery. On the road bike, he did it over a white/purple/blue/black fleck tape, and it hasn't aged well. It's changed colors so that is looks dark and grungy and is wearing away in places. It does look a lot better over the "leather" colored tape on that pretty Rivendell, though!