Mayco Silkscreen Medium is a thickening agent that creates a "ceramic paste" when added to paint, ideal for silkscreen processes on wet clay, bisque, glass, or fabric. 4 oz wide-mouth jar. - Mayco Designer Silkscreen Medium - 4 oz JarDesigner Silkscreens, SILKSCREEN MEDIUM - This thickening agent creates a "ceramic paste" when added to glaze and is ideal for silkscreening on greenware or bisque. Best used with Mayco Stroke & Coat Wonderglazes, Mayco Underglazes, and Mayco Designer Liners. 4 oz wide-mouth jar.