Adhesion is lost under porches or any other protected areas.
Possible Causes:
- Air pollution or other types of contamination can cause buildup.
- Salts were not removed before applying the new coat of paint.
- The new paint is applied to glossy hard films.
- The surface was not prepared enough.
Solutions:
- Properly prepare the surface of the area that will be painted.
- Pay more attention to the areas that are not directly exposed to weathering.
- Make sure the adhesion is adequate.