chiefbigredman wrote:http://www.astronomican.com/showthread.php?21943-Citadel-%28Games-Workshop%29-Vallejo-and-other-paints-conparisson-table
Neither of those lists contain the Model Air colour range; only the Model Colour and Game Colour ranges. Vallejo makes three primary paint ranges, one of which is formulated for straight out of the bottle airbrushing.
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I just started a new army using the Model Air paints so I don't have a concern with matching
GW colours and personally this is the way to go with a new army.
If you are trying to match it to an army that was started with
GW paints I would continue to use
GW paints thinned accordingly in the airbrush. It's kind of annoying to get the consistency right but if colour matching is important to you it's the only real way. Really you only need to match the base colour as blended highlights/shadows with an airbrush (if you're doing those) will either stand out as different from the rest of the army (if they're hardlined or washed) or blend in well enough to work so long as the base colour is right.