I use SEM, Its laquer so you mix it 1:1 with thinner. Works well. Spray a few coats then bring the pressure up a bit and stand back a little more to give the last coat some texture.
You shouldnt need an adhesion promoter on metal parts but bull dog is great for plastic and vinyl.
The factory called whats on the dash a swede finish. There have been numerous threads and responces concerning reproducing that finish.
The correct color can be a challenge. Try searching for those previous threads. Good luck