The first time you burn your soy candle, it is important to allow the wax to melt to edges of container, for however long it takes. This will create a burn memory.
If wax is not melted to the edge, the candle is likely to tunnel.
Each subsequent time the candle is lit, trim the wick to 5mm and allow the wax to melt to edges of container, approximately 2-4 hours per burn.
Burn the candle no longer than 4 hours at a time, as excessive burn time can lead to glass overheating and cracking.