I crumble tea candle wax into some mineral turpentine and then you can paint it on as a resist. You don't need an awful lot of wax. Remember to wash your brushes with detergent afterwards. You can't get it back off the paper, so be prepared for that.
I use a combination of drawing with the wax, using it crumbled, and using it with turpentine. Another fun thing to do is to let turps and metho (alcohol) fight it out in a wet wash.
Start small and experiment. Have fun!