AK Interactive 3Gen Primers - Grey Primer 100 ml Contains: 100 ml. Acrylic self-leveling primer for airbrush or brush application. Formulated for all types of surfaces. Shake well before use. High holding power. Fast drying can be sanded in 24 hours. Water soluble can be used directly or can be used diluted. Non-toxic. We recommend AK11500 Acrylic Thinner for a correct thinning.