Hōseki Adhesion Promoter [cite: 660] is a professional-grade prep solution engineered to greatly enhance the adhesion and durability of virtually all types of automotive finishes[cite: 660]. It acts as a powerful bonding agent across a wide variety of substrates, including problem plastics like TPO and polypropylene, bare aluminum, and bare steel[cite: 660].

Supplied completely ready-to-use with no mixing required [cite: 660], it can be applied directly under primers on flexible and rigid plastic parts, or utilized as a reliable tie-coat between fresh or existing primer and color[cite: 660]. Just apply the appropriate coats [cite: 662] and allow a quick 20-30 minute flash before topcoating or priming [cite: 662] for maximum performance[cite: 660].