A “paint-on” spacer that is applied directly to the refractory die. Z-20 is colored light yellow, so it can be seen clearly when painting it on the die. After degassing, the color changes to white. This product can be used to achieve a proper fit, as well as filling small bubbles and undercuts on the refractory die. Compatable with Cervest, V-tec, PLV, and similar refractory materials. Each package contains 1 bottle of powder (12g) and 1 bottle of liquid (30cc). Made in the USA.