Ok, I have been using this product for the last couple months and have been very impressed with the results until yesterday......I washed the car and treated the wheels but then sprayed the tires with Maguires Insane Tire shine which I recently purchased. (Previously I have applied a tire dressing with a sponge). Anyway, I drove the car for about 100 miles and was dissapointed to see the wheels now covered in brake dust. More brake dust than previous periods of even a couple thousand miles. It appears that although I was very carefull to limit the tire shine overspray onto the rims, it is enevitable to happen and this is what collects the brake dust. So, for the ArmourAll Rim Protectant to work properly, I will have to go back to applying the tire dressing with a sponge.