Rag Curls

Well, I was informed at the miss' dance class today that we have to do hair and makeup on the girls for pictures on the 17th and then of course for their recital next month. And their hair has to be done in big bouncy curls. Well, I learned a few weeks ago, that the miss' hair does not hold curls, well at least when I use a curling iron and tons of hairspray. So I was thinking of trying rag curls.
I found a great instruction for it Here
Do any of you have any experience with rag curls? Just curious. I think I may practice it this upcoming week or weekend to see how it works and how long the curls stay in, since her recital is in the evening.