Yayuan pioneered the "Composite Primer" in 2016. Specifically designed to address construction challenges in both new and old exterior walls, it is a high-performance composite layered foundational aggregate product.

It boasts wide substrate adaptability: no need for tile demolition on old tiled walls, minimal scraping on old walls, and strong adhesion to hollow or peeling substrates. It combines three processes into one, eliminating putty application and enabling direct spraying. Delivering excellent performance, it offers high adhesion, water resistance, crack resistance, and dedicated crack repair. For long-term convenience, it requires no wall scraping during renovations, features low cost for color changes, and integrates waterproofing and decoration in one solution.