ULC-500 Level-Seal is a two component urethane leveling compound capable of creating a moisture barrier of up to 18 lbs. CC or 97% RH. Once cured, installation can begin by applying adhesive directly to the urethane sealer. ULC-500 must be spread to a minimal thickness of 1/32" but can be applied as thick as 5". ULC-500 provides moisture mitigation and levels of STC/IIC that will meet most sound transmission codes, according to the company.