Hardie Airtight Seasoning
Hardie Airtight seasoning has been an icon of pipe maintenance since the 1960s, and even before that, when it was developed by the James Robertson pipemaking company in the 1930s. Bob Hardie bought the product when the Robertson shop closed in 1964. Not to be used in synthetic bags, it is perfect for all natural bags. Keep it in the fridge between uses.