What will make my dance shoes less slippery?

Roughen them up with a scr (they sell them on discountdancesupply.com. a href="http://www.discountdance.com/dancewear/style_BR1.html&pid=5459&Shop=Style&SID=260595743" rel="nofollow"http://www.discountdance.com/dancewear/s…/a . I know it says pointe shoe, but it'll work for ay kind of shoe.) or sandpaper. Use rosin. Use hairspray. :)