Tamiya Paint Retarder will make acrylic paint dry slower, enabling a smoother finish whether you airbrush Tamiya Acrylic paint or brush it onto a model. It can be used up to a 1:10 ratio with Tamiya Acrylic Paints. It helps to lessen the chance of painting a grainy surface on your model. Also, it is ideal for painting glossy finish surfaces. 1 bottle contains 40ml