304 CrownFlex is a two-component, low viscosity, 100% solids, semi-rigid epoxy fluid proofing and waterproofing membrane. It features a combination of excellent adhesion and elongation not available in general-purpose epoxy. Also, it is used as a semi-rigid epoxy membrane for crack bridging and crack dampening under epoxy coating and flooring systems. It is VOC Compliant in all states and provinces in North America.