Uny, you mentioned in another post that it is your calling to educate and teach. I have made this Schultz deep tissue repair. I just want to ask a question. I have a gallon jar with the wintergreen oil, olive oil,grape seed oil, 8 T of cayenne, 4 T mustard powder, 4T ginger powder, 4 oz arnica flower, 4 oz. of calendula flowers and I added 4 oz of St. John's Wort oil I had made. The liquid does not cover the dry material. I turn it and shake it. That will still work as far as the extraction process. What if I added the mentol crystal now and used a double boiler to gently melt the crystals?