CrownCrete U™ 1/8” Self-Leveling Product No. 818 is a three-part urethane polymer concrete super flowable product. It is a medium duty self-leveling material applied at 1/8” thickness using ½” v-notched rubber squeegee.The system can withstand aggressive chemical attack, thermal shock resistance, and high impact resistance. It is designed to be use as an underlayment providing superior functional subfloor for other polymeric toppings or for resilient flooring.