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Jan 26, 2021 Gypsum can be added to Portland cement to make the finished concrete lighter. In the manufacturing of gypsum cement, raw gypsum is mined from the earth and burned at an extremely high temperature to remove all traces of water. It is then ground to a very fine powder, and mixed with alum to speed up the drying process. When water is added to ...
STOPGAP 1100 GYPSUM is self-smoothing, but should any imperfections remain they can be removed by rubbing with a carborundum stone when the compound will accept foot traffic – typically 2 hours after application at 20 C. DRYING Drying is dependent on the absorbency of the subfloor, ambient temperature and humidity.
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