Ardcoat is a glossy VARNISH, but the way you are using it, you might want to take a good look at MATT MEDIUM or even GLOSS MEDIUM.
Both of those are terrific for mixing the inks the way that you've talked about.
I'm just curious, are you talking about Guide-coating the minis before you apply paint? Or are you talking about inking them afterwards? Because the second option should be done with some MINWAX, and is called dipping.
However, for Guide-coating, you actually apply the ink beforehand (over a white undercoat) then the paint takes the shading from underneath it.
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