From the Manufacturer:
Enkaustikos Wax Medium is made from U.S. Pharmaceutical Grade Beeswax and Damar Resin. Wax Medium has many uses when it comes to encaustics. It can be used as a topcoat, a basecoat, or can even be added to your wax paints to increase transparency for glazing techniques. For those who like custom colors, wax medium is ideal for mixing with your own pigments.