Model Air is used directly or diluted with Vallejo Airbrush Thinner or Flow Improver. The colours dry very rapidly and form a homogenous paint film of extraordinary resistance while preserving even the smallest detail of the model.
Kind of like marmite, you'll either love vallejo or hate it. I use both mig and vallejo model air , I find the vallejo very good for both airbrushing and using brushes and have used them for years.If your finding it a bit thick and clogging your airbrush id advise vallejo airbrush thiners 5 paint to 2 thiner drops and you shouldn't have any issues.