Plaster is a building material used for coating walls and
ceilings. Plaster is manufactured as a dry powder and is mixed with
water to form a paste when used. The reaction with water liberates heat
through crystallization and the hydrated plaster then hardens. Plaster can be relatively easily worked with metal tools or even sandpaper. These characteristics make plaster suitable for a finishing, rather than a load-bearing material.
From - http://en.wikipedia.org/wiki/Plaster
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