Acrylic paint is an integral component of the Temperaprint process. Temperaprint is a dichromated colloid process similar to gum, where the colloid happens to be egg whites. There are many examples available online. I've tried both temperaprint and gum with acrylic paint and I find them both lacking, but it is a matter of taste. For me, the opaque nature of the acrylic process limits what I feel to me a fundamental advantage of gum: the ability to allow colors to shine through subsequent layers. The result is a "poster-like" effect that CAN be very effective (and the online examples will demonstrate that). In my experience, edge effects are very difficult to bring off. as the acrylic paint seems to harden on its own in areas where one might expect it to be more soluble. The result is All-or-Nothing. There is no paint, or there is paint, but not the subtle variances that one gets with watercolor.
If there is interest, I can post some examples of some (unsuccessful) attempts I have made with acrylic pigments and gum.
Keith