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With Army Painter (or really any brand) brush-on primer, is it typical to need to cut it with acrylic dilution like we do with acrylic miniatures paints? Or is it best taken as-is?

RMS brush on can be thinned a little bit with water. Can’t help you with other brands.

Brush on primer is the worst primer option, messing with the stuff by thinning it will risk that you get patches without primer or primer too weak to adhere.

I primarily prime with my airbrush, using Vallejo Air Primer. That isn't as tough as rattle-can primer, but works fine. The Vallejo airbrush primer also works fine with a brush, eg when modifying a model or when avoiding colour shining through after airbrushing the majority of the model.

Why not give an answer to the question he actually asked? There are any number of reasons its not feasible for someone to have an airbrush as part of their set up. If you're halfway to competent, then using brush on, even thinned, will give you an even coat to work with.

OP, it depends on the consistency as it comes out the bottle - just like any other paint. I thin Vallejo brush-on ever so slightly, but it's pretty thing already. I've found Coat D'arms is good to go straight from the pot.

I tought I did adress it. Ah well.

I find the GW pot primer too thick for a brush and the Vallejo air primer too thin! I don't like cutting them with water since, as someone said earlier, it get blotchy. If I need to thin the paint (like the GW one) I use actual thinner. I know several folks like to use Gesso and maybe one of those lovely folks can chime in.

 Stephanius wrote:
I tought I did adress it. Ah well.

You did, but the part about the air brush isn't relevant.

It was not thinned, and judging by the models seems to go on fine by hand.

I have typically sprayed, but have had some issues with overspray in the past - and now that winter is upon me, I suspect I wont be using spray primer for quite a while.