BOOU Cementitious Crystalline Waterproof Coating is a high-performance inorganic waterproofing powder material composed of active chemical compounds blended with Portland cement and quartz sand. This advanced crystalline waterproofing solution uses water as a carrier to penetrate deeply into the concrete substrate (30–50mm), where the active ingredients react with unhydrated cement particles and calcium hydroxide to generate insoluble, needle-like and dendritic crystalline deposits. These crystals fill the capillary pores, micro-cracks, and voids within the concrete matrix, forming a dense waterproof barrier from within the structure itself.