Question Is it possible that the PolyTune Clip damage the finish on my instrument Answer Depending on various factors such as age-related changes or the surface finish, there is a possibility that your instruments coating may be damaged by attaching this product. In general, do not leave accessories such as PolyTune Clip attached to your guitar longer than necessary, as the rubber pad may adversely affect the finish of your instrument, especially when it is exposed to sunlight for extended periods of time.