XD Wax Medium gets it's name from the extra damar used to make it. A higher content of damar resin than the original, gives it a thicker consistency when liquified. It also has a sticky tack while drying for easy texture build up and will stay pliable for a longer time.
Once cooled however, it is resistant to surface alterations from scraping or incising and offers a hard film. It can be used as a base coat, wax paint extender for glazing, and especially useful as a topcoat.