1. Before you light your candle, trim your wick to 5mm.
2. When you light your candle let it burn for long enough for the melted wax to reach the edges of the jar. This will prevent your candle from burning a tunnel down the center of the wax.
3. Trim your wick to 5mm between each burn. If you don't do this, you may notice the candle flame is weak and preventing your candle from burning optimally.
4. Let your candle cool completely before relighting.