The Polyurethane Intermediate Coating (Non-Exposed) (DK-550) is a two-component polyurethane waterproofing product based on polyol and cycloparaffin resin, mixed with a hardener containing polyisocyanate for curing. It provides excellent elasticity and elongation, offering superior waterproof performance in non-exposed areas. The coating forms an effective waterproof layer in areas not exposed to external environments, ensuring long-term, strong protection.