Does Primer Promote Adhesion
Gardz is a great primer- so that part is good to go- and there is no problem of adhesion from a latex/waterborne to another -unless- there is contaminants or a very glossy surface.
Sounds like you have neither problem, and most acrylic based paints (like Aura) have pretty good adhesion qualities themselves .
( which is part of why the paint and primer hype)
In short- i think you're good to go.
"It's better to come here with questions before you screw up than to come here after and ask how to fix them."- JS