There is a recent thread in Tech Talk where I list the best uses I have found for fo.Q TA-32 (thin tape) and TA-102 (thick tape). Generally the thin tape works best on cables and connectors, thick tape on components and chassis. I’m generally more on the side of "more is more" when it comes to fo.Q. But it boils down to personal taste and your sensitivity to coloration produced by low amplitude vibration.
You have to realise what is happening with fo.Q. It is reducing the amplitude of already very low amplitude mechanical vibrations. As the amplitude decreases, the effectiveness increases. It’s not a conventional damping material like rubber or Sorbothane. It will effectively reduce the amplitude of vibrations that have such low amplitude that you may not realise they exist. Until they are gone.
You have to realise what is happening with fo.Q. It is reducing the amplitude of already very low amplitude mechanical vibrations. As the amplitude decreases, the effectiveness increases. It’s not a conventional damping material like rubber or Sorbothane. It will effectively reduce the amplitude of vibrations that have such low amplitude that you may not realise they exist. Until they are gone.