While you are waiting for the size to set, start mixing your paints. You’ll need to add an acrylic polymer (like GAC-900) to every paint you plan to use to ensure that your finished scarf is washable. The ratio should be one part GAC-900 per one part acrylic paint. For this project, consistency matters. You want the paint to be thin enough so that it will float on top of your methocel mixture – if it’s too thick, it will fall to the bottom. Aim to make all your paint mixtures the same consistency as whole milk, adding water if needed.