Pro Acryl 1-Step Special Sauce MediumPRO Acryl 1 Step Special Sauce is the perfect way to dilute your other 1 Step colors or to turn any of your other PRO Acryl colors into 1 Step paints! Simply mix it in as needed to thin 1 Step colors to the desired opacity for various techniques like glazing and filtering or mix around 2: 1 (medium to paint) for adding the power of 1 Step to other colors in your collection. 120ml bottle