Sorry, very slow reply. I will post the process as I progress with body mouldings. Last time they were filled with polyester filler.
I haven't had much time to work on the car, but have been making some progress on 'very' difficult to find items.
I lost an auction for silly money on new OEM ventilation louvres, and gave up finding a new set.
So I resigned myself to painting, or wrap in vinyl. I decided to try gloss black vinyl wrap first, and was very happy with the result. The item at the back is a brand new OEM unit for reference.