The Bolt 2 is for use with essential oils. Dry herbs can damage the coil and we highly advise against using any type of dry herb in your Bolt 2. A variety of substances, consistencies, and flavors of essential oils can be used on the Bolt 2.
Remove any liquids/oils on the nail by heating the nail and using a cotton swab to wipe/remove any unwanted residue. This will help the longevity of the nail, as no oils will be building up inside over time with proper maintenance.