The plaster surface is meant to degrade slowly, eventually requiring a fresh coat, or at least some pool plaster repair. Plaster finishes provide twenty years of service under ideal conditions, however, ours is rarely an ideal world. Used underwater, it provides the watertight seal that the more porous gunite or shotcrete beneath it cannot. pH will rise the first season with new plaster, so get a large bucket of pH Decreaser, to keep the pH in the 7.6 range, and a bucket of Alkalinity Increaser, which will drop with the frequent pH Down adjustments.Īlso called whitecoat or marcite, pool plaster is an age old process of finishing many structures. This is the time that takes the most work, usually a lot of brushing and backwashing due to dusting from the new plaster. Once the pool is full, the system is started up and balanced with chemicals. Once the plasterers apply the finishing touches, they start filling the pool with water immediately, as plaster cures under water. As the final step in the pool construction process, the pool interior is sprayed with a wet plaster mix, and troweled smooth. The tile and coping stones are set in place. After that, the pool is shot with gunite (or shotcrete), which is concrete that is shot out of a gun or large spray nozzle, and troweled to the finished shape. The main drains, skimmers, return lines, pool lights etc., are set into place. The process starts with digging a hole in the ground and lining the hole with rebar. Concrete pools are the oldest form of building pools.
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