Most people think that would be impossible. But it is not. This slurry will stay in suspension for days. How? It is flocculated using a tiny bit of powdered epsom salts. Without the epsom salts it is watery and will settle in seconds. How does the slurry apply to this porcelain? Since it contains no clay it has complete permeability. Against the immersed bisque a layer builds very rapidly, pieces must be dipped and removed immediately. Does it dry hard enough to handle? Yes.
In ceramics, glazes are suspensions. They consist of water and undissolved powders kept in suspension by clay particles. You have much more control over the properties than you might think.