If you want to extend the life of your jar candles, follow these tips: trim the wick to about 1/8″ every time you light it. This helps the wax to burn slower and at a more even pace. It also helps to prevent soot from building up on the glass. Be sure to burn your candle long enough so it prevents tunneling (the hard wax ring that forms around the flame when the top layer of the candle isn’t fully melted). A rule to follow is to burn your candle an hour for every inch the candle is wide. When it’s time to blow out the candle, do so gently so the wax doesn’t splatter or use a snuffer.