industrial roller brush

What Is Needed For Proper Coating Adhesion

For optimal adhesion of a concrete floor coating, ensuring the longevity and durability of the coating, it's essential to meet specific criteria before application. These criteria are fundamental in preparing the surface for coating and can significantly influence the outcome and performance of the coating system. The key criteria include: 

1. Surface Cleanliness: The concrete floor must be free of contaminants, including oils, greases, dust, and any other substances that can impair the adhesion of the coating. Thorough cleaning is crucial to remove all forms of contamination. 

2. Proper Surface Profile: A suitable surface profile is necessary for the coating to mechanically bond to the concrete. This can be achieved through methods such as shot blasting, diamond grinding, scarifying, or acid etching. The industry standard for many coatings requires a profile equivalent to CSP (Concrete Surface Profile) 2-3, which resembles the roughness of medium-grade sandpaper. 

3. Moisture Content: The concrete must be dry with a moisture content generally recommended to be below 4% as measured by a moisture meter. High moisture levels can cause the coating to fail by preventing proper adhesion or causing blistering. 

4. Porosity: The concrete should be porous enough to allow the epoxy or coating to penetrate the surface, enhancing the mechanical bond. 

5. pH Level: The pH level of the concrete should be neutral. Extremely high or low pH levels can affect the adhesion of the coating. A pH test can determine if the concrete is within the acceptable range, typically between 6 and 9. 

6. Lack of Previous Sealers or Coatings: Previous sealers or coatings must be completely removed to ensure the new coating can properly bond to the concrete. This may require additional surface preparation methods. 

7. Cure Time: New concrete must be allowed to cure adequately—typically for at least 28 days—before a coating is applied. This ensures that the excess moisture within the concrete has sufficiently evaporated. 

8. Temperature and Humidity: The application should be done under suitable temperature and humidity conditions as specified by the coating manufacturer. Too high or too low temperatures can affect the curing process, and high humidity can introduce moisture to the surface. 

9. Crack and Defect Repair: Any cracks, holes, or other defects in the concrete should be repaired and filled before the coating application to ensure a smooth and uniform surface. 

Adhering to these criteria can significantly enhance the adhesion, appearance, and longevity of the concrete floor coating, ensuring a successful and durable installation. 


Back to blog