The epoxy is peeling or “letting go” from either the concrete or between layers of coatings.
Delamination from substrate:
Improper Cleaning: The epoxy will not adhere to dirt, grease, or other contaminants.
No Primer Used: When priming is skipped, delamination may occur.
Moisture Vapor: Water vapor penetrating up through the substrate can cause peeling or delamination. After removing the problem areas, you may notice the concrete being dark from being damp.
• The coating must be removed by grinding or blasting.
• Re-applying the epoxy after proper preparation.
No primer Used:
• Remove the coating by suitable means.
• Prime and recoat after proper preparation.
• Remove coating by suitable means.
• Measure moisture level; consult product data sheet and/or dealer before reapplying.
Improper Cleaning: Properly clean the substrate and provide a suitable profile by mechanical grinding or shot blasting.
No Primer: Use a suitable primer or prepare a primer following directions.
Moisture Vapor Transmission:
• Substrates should have a properly installed and effective vapor barrier if in contact with the ground.
• Always perform a calcium chloride test prior to installation. Test results should be no more than 4 pounds per 1,000 square feet per 24 hours.
• Approved primer systems should be used on readings that are higher and/or mitigate the moisture levels.