I'm not sure what paraffin Joann's has. Maybe try some 4625 from one of the candle supply stores? Or if you want a para/soy blend you can get tart waxes from several suppliers that's already mixed. Flaming, Virginia, WSP, all carry a para/soy tart wax that's granular and easy to use. It will ripple on you if it's poured too hot though but it's an easy fix. Like NightLight said, you defiantly need a thermometer.