I have been advising you to use the Rublev Wax Medium- a product I used happily for years.; http://www.naturalpigments.com/wax-medium-2261.html
I just ordered a new batch- it is- for me and for my purposes unsuitable as it has been- without warning reformulated. I noticed it immediately upon opening the can- it used to come in a plastic jar. The paste was a darkish yellow and it had gritty bumps in it. I thought the bumps would go away when I mixed it with paint- they did not no matter how hard I tried. This was particularly frustrating as my model was due to arrive and I had to throw out a very expensive batch of Micheal Harding's Cremnitz White in Walnut oil. I posted my review on the Natural Pigments website- but they did not put it up. The old wax medium read on its jar- Beeswax and Damar Paste. The new can reads Beeswax and Resin. The can ingredients read naturally bleached beeswax, and pale partially hydrogenated thermoplastic resin in odorless mineral spirits.
I substituted the Gamblin Cold Wax Medium which is made from naturally white unbleached beeswax and odorless mineral spirits.
Here is an interactive guide from Gamblin on mediums.
If anything I like the Gamblin better- it is softer and blends better.
The Rublev wax paste may be useful for some other purpose- I have no idea what for.