Yes, CB200 & CB300 can be applied over existing damaged coatings, provided that all loosely bound particles and flakes have been properly removed.
In damaged areas, the CB fluid will penetrate and reach the exposed metal surface, whether rusty or bare, forming a protective layer against corrosion.
To ensure optimal adhesion and performance, it is recommended to clean the surface using high-pressure water to remove any loose rust, paint, oil, or other contaminants.