The amount of added water will determine the stiffness of the finished mixture. Only with experience will you find the best consistency is


19.9a- b: The mixing station involves hard work and repetition as sand is shoveled into the mixer, followed by the bagged lime/cement.

for you. In general, the plaster should be stiff enough to maintain itself in a blob on your mortarboard or hawk, yet wet enough to be pliable under your trowel.

It's very easy to over-soak your mixture. Plaster mixtures will seem too dry until they hit their saturation point, and then they become too wet very quickly. Give your plaster enough time to thoroughly mix before adding more water, and then add water slowly, a bit at a time, allowing it time to mix again. If your mix is too dry, however, it is possible to jam up a mixer — a situation better to avoid! Unless you are dealing with bagged gypsum plaster, the quantity of water required will vary from batch to batch, so precise measuring is not possible. Using buckets rather than a hose for water will allow for accurate approximation, and you will very quickly get the hang of creating a desirable mix.

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