The primary task before applying Bore-Wrap is to ensure the surface is clean and free from oil and debris.  Use a holiday detector to verify that the anti-corrosion coating is fully intact before applying Bore-Wrap.  Bore-Wrap bonds through a combination of surface tension, hoop strength, and compressive strength.  These factors/properties are inherent in the products design and will be present regardless of the level of surface roughening done to the underlying anti-corrosion coating.  While adding some surface roughening may increase adhesion, it is not always necessary.  For specific applications contact Denso for further information.