Cambodia Chinatown

Background

Located in the core business district of Phnom Penh, Cambodia, this project is a large-scale commercial complex integrating shopping, dining and entertainment, with a total construction area of 120,000 square meters and over 36,000 square meters of exterior wall area. As the region has a tropical monsoon climate with high temperature, heavy rainfall and ultraviolet radiation intensity up to 1800 kWh/m² throughout the year, traditional exterior coatings are prone to fading and peeling, failing to meet the durability requirements for long-term use. Therefore, the project owner set extremely high standards for the weather resistance, crack resistance and decorative performance of the exterior coating. The technical plan adopts a three-layer composite coating system: the primer layer uses an alkali-resistant sealing primer with adhesion strength ≥5MPa to effectively block the penetration of alkaline substances from the wall; the middle layer is water-in-sand multicolor paint with particle size ranging from 0.1 to 0.3mm, featuring a covering power ≥98% to perfectly reproduce stone-like textures; the top layer is a weather-resistant exterior paint with artificial aging resistance time ≥6000 hours, and finally a transparent clear coat with solid content ≥45% is applied to form a dense protective layer via self-crosslinking film formation. Before construction, the substrate must be thoroughly treated to ensure its strength ≥10MPa and flatness error ≤2mm. After removing surface dust, oil stains and loose materials, the alkali-resistant sealing primer is applied. Once it dries completely, elastic crack-resistant putty is applied to utilize its crack-resistant property to offset the cracking risk caused by minor wall deformations. Then the water-in-sand paint is sprayed with a wet film thickness controlled between 0.8 and 1.2mm, and finally the clear coat is applied to guarantee leveling performance and avoid orange peel defects on the surface. After completion, third-party testing showed that the coating's artificial aging resistance time reached 6200 hours, far exceeding the designed requirement of 6000 hours; the crack resistance performance was tested to withstand substrate deformation of ≥1.5mm without cracking, and the covering power remained above 99%, perfectly replicating the texture of natural stone. This coating system demonstrates excellent stability in the high-temperature and high-humidity environment of Cambodia, with an expected service life of over 15 years, providing a reliable durable solution for exterior decoration of local commercial buildings.