Consolideck PolishGuard is a water-based, VOC-compliant protective coating for polished concrete floors that resists etching from spills of acidic liquids such as vinegar, milk, fruit juices and soft drinks, and staining from other contaminants. In a documented test, a test panel protected with PolishGuard withstood four hours of exposure to vinegar. The same solution and exposure severely etched a similar, unprotected polished concrete panel. Prosoco Inc. 800-255-4255.