Clean, fat-free and dry surfaces result in maximum strength. BONDAN Cleaner effectively removes grease, oil and dirt from metallic and non-metallic surfaces. Primers, or adhesion promoters, are always used when the adhesive cannot bond two components on its own due to the material surface properties. Activators can be used when faster curing is desired or to enable bonding of metallic and non-metallic materials using an anaerobic adhesive.