According to Duplicolor the trim paint is "Satin black".
I personally didn't use any adhesion promoter on mine. Their adhesion promoter is intended for lacquer and enamel paints. This would definitely need to be used if you wanted to paint the bezel a color using regular paint. According to the label the paint bonds with plastic, kind of like Fusion. I did make sure that the plastic was very clean and I ran a scouring pad over it to dull the surface before spraying it. I have been very impressed with this stuff. The factory finish started peeling within the first year of having my truck. I didn't take it back to Ford because when I called they gave me the impression that they would have my truck for days just to replace the bezel.
It has been at least six years since I repainted it and it still looks like new.
Duplicolor also makes what the call "bumper paint". It also has a satin black finish (as well as gray, silver and charcoal) and is very durable. I use it as a final liner coating in my RC car bodies. Stuff is tough. Even with the flexing of the lexan body and the oil of the nitro engines it manages to hold on.
I am planning on painting the factory gray bumper with it soon.