CMC Gum is a material that can be added to glazes to make them adhere better and slows drying. CMC Gum is used in many different applications in ceramics, most common being its use in brushing glazes. The powdered gum is nearly impossible to properly disperse in water, meaning adding it directly to a glaze is not as effective. To correctly mix the gum into a slurry, a gum solution should be made. This can be done by boiling water and the powder and mixing it vigorously with a mechanical mixer. Then to add it into your glaze, replace some of the water with the gum solution. Different glazes require different amounts to work correctly.
Information gathered from Digitalfire Ceramic Materials Database.
