I got me the Rubber protectant Sonax bought a few weeks ago and am now super convinced! The handling is easy, you might need a quarter of an hour for the car but after that you have no more trouble! After applying you should soak it briefly and then you notice immediately how the rubber is much much smoother, nothing can get stuck here longer. every time I close my door I am amazed how smooth and silky my seals have become and my car, Audi 90 Year 1989 is not just the youngest. Super Care at a great price!