Heavy-Duty, Pressure-Sensitive, Multi-Flooring Adhesive Ultrabond ECO 399 is a high-moisture-resistant, heavy-rolling-load-resistant, aggressive, pressure-sensitive adhesive with enhanced dimensional control properties designed to install a wide variety of resilient flooring types. Resistant to heavy rolling loads Minimizes gaps in luxury vinyl tile and plank Resistant to high moisture Allows up to 6 hours of working time