I too have a clear bra on a black CS. It's been on for about 7 months. The edges became more visible until I changed my wax. What had happened (and it's subtle) is that wax accumulated at the edges where it's hard to completely buff off, and then whitened. I had to carefully remove this wax with a small rubber pick being really careful not to harm the paint (in case I ever remove the bra). I then switched to a high grade carnuba wax and the bra is essentially invisible again. We'll see how long this lasts.