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Gypsum board systems are the dominant interior wall and ceiling finishing solution in residential and commercial construction across Europe, Southeast Asia, and the broader Asian market. The performance of a gypsum board installation depends not only on the board and framing system but on the joint compound, skim coat, and finishing mortar that create the smooth, seamless surface required for decoration. Hydroxypropyl Methyl Cellulose is the additive that determines whether these finishing products are workable, crack-resistant, and easy to sand, or whether they crack, shrink, and resist finishing tools in ways that slow installation and increase labor cost per square meter.