GSI (Gunze Sangyo) Solvent based paints. Come in a variety of useful colors in 10ml bottles. Brushable from the bottle, or use GSI Mr. Leveling Thinner to run through your airbrush.
Glaze Medium is a colorless glaze, used to mix with acrylic colors; improves fluidity, increases transparency, and slows drying time. Ideal for shadows, shadings, glazes and working with pigments.