1) Mix up three parts FO or EO with one part DPG in a spray bottle or squirt bottle, Shake well.
2) If for instance you mixed 3 oz Fragrance oil with 4 oz DPG, then you would take about 50 incense sticks and put them in a gallon size plastic bag. If you are using a spray bottle, spray the incense sticks on one side, then turn over and spray the other side. Keep doing this until the sticks are completely coated. If using a squirt bottle, squirt solution on sticks, very gently rub sticks through plastic, keep doing this until coated.
3) Close bag, leave for 24 hours to absorb all the oil possible, then take out and dry 24 to 48 hours.