I use GL 70/30 wax in this size jar and have had GREAT burns with 2-CD6's and one 60-44-18z. Both burns were totally clean - no hangup at all, no soot, jars not too hot to touch. The zinc mushrooms a bit, but not too bad, plus it's the only wick I've found that I can single wick this candle with and end up with a clean jar.