It's easy to prepare, easy to model, very economical, and exceptionally white when dried at room temperature. Finished projects are very lightweight. Furnished in dry form, it mixes with water and is ready to use immediately. Claycrete® will start to set up in about 30 minutes, at which time fine modeling and smoothing of the surface is easily achieved. Additions of more Claycrete® are possible at any time during the modeling process. Mix only as much as can be used in 1/2 hour of modeling time.