All 4 colors are acrylic and formulated for maximum performance both with brush and airbrush. The Scale Reduction-Effect allows s-steel agitator to facilitate mixture. Water soluble, odorless, and non-toxic. Shake well before each us you to apply the correct color to your models. Each 17 mL jar includes a stainless. We recommend Acrylic Thinner A.MIG-2000 for correct thinning. Dries completely in 24 hours.