The company MikeV posted the link to is the one I used for Watson. I used the one that was clear coat and base in one, but that was because I was doing the engine bay. For the exterior I would do it was two separate layers, as you should wet sand each layer. That is how I did brandy's scoop and mirror caps on Ebony.
I would also recommend scuffing the ducts with a find sand paper and using a plastic primer. It sounds like a lot of steps but it is actually very easy, just patients and take your time.