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LOCTITE PL400 is a premium polyurethane subfloor adhesive engineered for professional flooring installations. This 28 oz cartridge delivers superior bonding strength for hardwood, engineered wood, and bamboo flooring over concrete, plywood, and radiant heat systems. The low-VOC formulation meets environmental standards while maintaining exceptional moisture resistance and flexibility. PL400 cures to a waterproof bond that accommodates seasonal wood movement, reducing callbacks and ensuring long-lasting floor stability. Ideal for both new construction and renovation projects where reliable adhesion and durability are essential.