How can I avoid candle tunneling?
Always allow your candle to melt all the way to the edge of the jar the first time you burn it—and every time after. This creates an even “memory burn” and helps prevent tunneling (aka the sad candle sinkhole).
To keep things burning evenly, avoid placing your candle in drafty areas and trim the wick to about ¼ inch before each burn. Drafts and long wicks can cause uneven flames, which leads to uneven wax melt. Once tunneling starts, candles tend to repeat the same burn pattern, making the problem worse over time.
If your candle does start to tunnel, don’t worry—watch this tutorial for how to fix it! [Tutorial by @Cityline on Youtube]