Wax
From BME Encyclopedia
If you came to this entry looking for hot wax torture and the like, check the entry on wax play instead.
Beeswax, vegetable waxes, and vegetable oils (but not paraffin wax) are often used to treat the surface of wood to seal it and prolong its life. It should be noted that over-oiling or over-waxing can actually reduce the life of the jewelry.