You still need to rough the surface to ensure good adhesion between the base coat and the bonnet.

People have successfully skinned bonnets and other large panels before, although I recommend a small piece to start with or work on a spare panel from the scrap yard in case it goes wrong.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Let's say you have a bonnet you want to skin with carbon. How to prepare the surface (which is obviously made of paint and clear coat) ?