Applying paint over a concrete curing compound largely depends on the type of curing compound used and the compatibility of the paint with that compound.
Film-Forming Compounds and Paint Compatibility
When using film-forming curing compounds, it is generally not recommended to apply paint directly over them. The film left by the curing compound can interfere with proper paint adhesion, leading to peeling, bubbling, or flaking of the paint surface. This is especially true for solvent-based curing compounds, as the solvents may affect the paint’s ability to bond with the concrete.
However, if you still wish to paint over a film-forming curing compound, certain steps can be taken to increase paint adhesion. One method is to mechanically roughen the cured compound’s surface before applying paint, such as by using sandpaper or a wire brush. This roughens the surface, creating more texture for the paint to adhere to. Another option is the use of special primers designed to improve paint adhesion on curing compounds. These primers might need to be applied before the final paint.
Penetrating Compounds and Paint Compatibility
The application of paint over penetrating curing compounds is generally less problematic. Since these compounds do not form a barrier film, the adhesion of paint is typically not affected. However, proper surface preparation is still crucial to ensure successful paint adhesion. The concrete surface should be thoroughly cleaned, free from any contaminants, and primed if necessary.The compatibility of paint with a concrete curing compound depends on the type of compound used. Film-forming curing compounds, especially solvent-based ones, can hinder paint adhesion and might require additional steps for successful painting. On the other hand, penetrating compounds generally allow for easier paint application. It is always advisable to consult the manufacturer’s instructions for both the curing compound and paint to ensure compatibility and better results. Proper surface preparation and, if needed, the use of primers can help overcome potential issues, providing a long-lasting and aesthetically pleasing painted concrete surface.