I've never put anything on my interior red dash in my 02' S2000, but did try Vinylex from Lexol

 

That works good, but it was to shiny for my taste, especially on the airbag cover. 303 protectant works well too, and is not as shiny.

 

Yeah, but my fiancee touches the dash to help her get out and she always leaves fingerprints. I use the stuff and like it.

 

I use Zaino leather in a bottle on mine, it protects it and looks just like stock after it dries. Same goes for the seats and all the other Leather/Vinyle in the car. Oh, and a nice leather smell for about a day or so.