I love my Rotex pads, they have been on the car since about 800 mile's. The only time I've had any dust build up was when I took it to the US 41 Track event on May 17th. But I guess that't's to be expected making 34 runs up to 120 MPH then standing on the brakes at the end of the track to get to get slowed down to turn into one of turn of off lanes .