I have recently discovered that liquitex airbrush medium is awesome stuff for thinning VMC paints, but I do find that it adds a little sheen. Do any of the other ranges, like golden or creatix (spelling?)have a more matt varitey?
Awesome, the local art store here in halifax sells createx paints and products, I must go down there and pick some up. I mix it about half and half with water when I thin my paints, works great.