LOCK A499 PSA™ is a universal, high-tack, water-based adhesive specifically formulated for the installation of most resilient flooring in residential and commercial applications. LOCK A499 PSA™ is a 0 VOC formulation. LOCK A499 PSA™ flashes off quickly, but has a long working time. It displays tenacious bond strength. LOCK A499 PSA™ has been formulated with exceptional application properties including excellent trowelability, fast tack/ grab, low odor, and easy cleanup.