Darvan is usually used for porcelain bodies, it eliminates the problem of white "mold" growing on the molds. It is very powerfull and has a wider deflocculation curve than sodium silicate. a gallon.
WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.