What type of tape do you use to tape down the loose ends of your bar wrap?

I wrapped my bars with the Novaro bar wrap from REI. Unfotunately, I needed to reapeat the job because I didn't do a great job the first time. I couldn't reuse the tape that came with the wrap, so I used electrical tape instead, which has not worked very well (keeps coming loose).

Note: To avoid confusion, I've used "wrap" to mean the bar tape that wraps around your bars, and "tape" to mean the tape that holds down the loose ends.

Paul