Gypsum mix: plaster and cement-gypsum products, a version ...
Usually, for 1.5 kg of gypsum (gypsum-lime powder), 1 liter of water is taken, after which a plasticizer is added (5-10% of the total volume). It is possible to make waterproof plaster, or rather, to give it moisture-resistant characteristics, by carrying a high penetration acrylic primer on top of it.
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