Colour Primer (for Airbrush)

Looking for a Caliban Green-equivalent primer for airbrushing, along with some kind of dark-blue or dark-purple primer that I could pour into an airbrush— as opposed to using a rattlecan. Any suggestions or recommendations?

Gonna be building up not only a Salamander army, but also some Dark Kraken successor chapters on the side too. I was hoping to see if there are functional primers that are not black, white, grey, brown. And also doesn’t come from a rattlecan.

With love, Battle-Brother Arita