Special wicks are required for candles made of pure stearine. The type number of the wick (30-40-50-60-70-80) corresponds to the thickness of the candle in millimetres. So, for a candle with a 6 cm diameter, you would use Stearine wick 60. With tapered candles, the maximum diameter must be taken into account. Thick stearine candles are never leak proof, so a coaster or candleholder must be used. Stearine candles burn with a large flame. Trimming the wick to reduce the size of the flame will aggravate the leaking.