Why is the product peeling off from the repair area?

QUIKRETE® Polymer Modified Structural Repair is designed to bond to properly prepared clean concrete. If the product is peeling off, the repair area was not adequately cleaned or prepared prior to application. All surfaces should be clean and free of foreign substances including corrosion present on reinforcing steel. Remove all spalled areas and areas of unsound concrete. Dampen the repair area with clean water before patching. No standing water should be left in the repair area.