I usd SEM to color most of my interior from blue to black and even colored a seat from white to black. This material looked very natural and held up great for several years. I am working on 7 years (40k miles) for the door panels, visor and dash pads but I have since put new covers on the seats.

Only one word or caution clean, clean and clean again. I used an amonia based cleaner and the SEM vinyl or platic prep (as appropriate). If you even see a hint of fish eying you have not cleaned enough. Stop wipe the stuff off and clean some more.