Dave, my roadster mk 1 had (has....ish) the glossy paint laquer.shiny grey.
By the time the car was a year old it was all coming off with white corrosion under it....aluminium I suppose. The factory sent me a new pair (also painted) under warranty and I have them in a drawer ready to fit if I have a new windscreen, or ready for the new owner should I sell the car one day.
My guess is that the factory got fed up with the problem and just stopped painting them.
Nick