The water glass (adhering to the wax with the slurry) reacts to this solution in the bath,

The water glass (adhering to the wax with the slurry) reacts to this solution in the bath, thereby curing the layer. This layering process is repeated a number of times until the layer is sufficiently thick enough for pouring. If necessary, a smoother casting surface can be achieved by using the first ceramic layers as it is used in the silica sol technique. Only it will take longer to make the shell.