It's rare I have a gutted room with nothing to drape, tape and protect....
So painting is somewhat of a let's get it really super right .
Current substrate is lower 24" - new rock and mud.
This has been sealed with Gardz already.
The remainder 6' of the wall is clean, not greasy.....matte Muralo Ceramic paint on it.
I have sanded the entire surface to knockdown primer grain but as well as just scuffing the exisiting paint surface.
I'm doing 2 coats of Aura Matte. I like the stuff primarily as you can sponge it/scrub it to clean a spot without ~burnishing~ the paint.
Will there be any benefits putting a coat of primer on the entire surface. Does it promote/improve on paint adhesion ?
I have cans/buckets for Gardz and FreshStart so it's not any extra for me other than a roller and a liner.
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