The Laguna catalog is striking for the number of different kinds of plaster they stock (at the time of this writing: fifteen). This catalog is an eye opener to the number of applications in which plaster is used and the number of properties needed. Among these are ability to pressure purge, the wet strength or dry strength, setting expansion, setting speed, absorption, density, toolability, suitability for hand layup or carving or layering, ability to surface harden, high density for simulating stone, low water needs, fire resistance and others. Plastic notches and molduct tubing are notable also (these are not generally easy-to-find).
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