The coating of the frame becomes dull and tarnished due to oxidation or ultraviolet rays. BIC-238 restore metal finish to its original-looking. BIC-238 is suitable for both matt and clear coating, it leaves a protective film to repel water and atmospheric pollutants, does not leave an oily film, safe on paintwork, clear coat, carbon fiber, chrome, metal & plastics, and prevents grime build up on treated surfaces. Suitable for every part of bicycle.