For students who are taking my Powerful Design and Personal Color Course, many work in acrylic paints and I myself use them much of the time in my studio; although I do my demonstrations in cold wax/oil, the majority of the course is geared toward the design and color principles which apply to all mediums :)

You cannot mix cold wax medium WITH acrylics, but you can work with cold wax/oils on top of Acrylic work (I recommend you put clear gesso over the surface of a dry acrylic painting before proceeding to use the cold wax and oil). However, you can try a product called Powerwax, a water soluble wax made by Powertex, which I just learned more about from Marion Linnenbank (info@powertex-onlineopleidingen.nl)
) who you can contact by viewing her business card attached here. She is a distributor in the Netherlands but said this product is available in 30 countries so perhaps there is someone in your part of the world who can give you more information about this product! If you are in the US, you can also find this product here on Amazon.com.