Here is my attempt at restoring the radio faceplate on my 1977 datsun 280z. I used this same process for the climate control bezel. Not perfect, but better than before.
Items Needed:
SEM 39863: Plastic Adhesion Promoter
SEM 38353: Plastic Prep
SEM 15013: Landau Black- Color Coat
3M Scuff Pad
Chrome Paint Marker https://www.amazon.com/dp/B0B212M89Z?psc=1&ref=ppx_yo2ov_dt_b_product_details
you can probably use any marker of this type, this one was just cheap and worked pretty well.
Starting Peice. Chrome had faded, been scuffed off in areas. The sun had also caused fading in the black plastic and blotching as well.
To Start I first washed the peice in the sink with dawn and scrubbed it. I then went at it with the 3M scuff pad and removed all the chrome, as well as roughed up the surface in preparation for SEM. I then washed it again.
Next, I hung it outside and used the SEM plastic prep to clean it, and wiped it down again. After that just follow the directions for the SEM adhesion promoter, then I did about 3 coats of the Landau black with about 6mn in between each. Came out smooth and consistent.
I then waiting a day for it to dry and came back at it with the chrome marker. Just spend your time going over the lines and it will turn out decent. The ink comes out a little fast though, so be careful to not hold it in one place too long.
FInished Result
I didn't clear coat the whole thing as it didn't occur to me until now. Would be nice to hopefully make the chrome paint a bit more durable for when you detail the car. Unfortunately the color coat is long past it's dry time so I am not sure if clear coat is an option now. If anyone has experience on this let me know.