ASMACO PU 850 PRIMER serves as a critical preparatory layer that enhances the bond strength between substrates and polyurethane waterproofing membranes such as ASMACO WP 810, WP 900, and WP 936. Its moisture-curing technology ensures reliable performance even in high-humidity environments, while the solvent-based formulation enables deep penetration into porous surfaces for a secure anchor. This primer is suitable for a wide range of surfaces, including concrete, metal, and cementitious screeds, and provides improved resistance against delamination and water ingress. It ensures better coating uniformity and maximizes the lifespan and effectiveness of subsequent waterproofing applications.