The camera in the windshield is used for the lane keeping assistant and if the windshield gets muck on it that covers the camera, you will get lots of errors when using that function. The radar should penetrate a thin amount of ice, but if there are other material in the ice, perhaps it would attenuate the signal. Plastic-dip paint though is a PVC based formula and should be completely transparent to radar waves. Look at it this way... The radar sits behind a piece of plastic (the medallion) and it is not affected by that. On planes with radar, the radar sits behind plastic and it is not affected by that. And if I put it on and it should somehow cause issues with the ACC, I can peel it off.