You can use the SEM or Dupli-Color to paint/dye the metal trim pieces as well, you would need to just scuff the pieces with a red Scotch Brite pad(found at any Paint Supply or well Stocked Auto Parts/Larger Hardware Store) to promote adhesion with the metal.
When scuffing the pieces, you don't need to remove the previous paint, just scuff it enough so that you don't see any sheen in the finish. The original coating will act as a primer coat, so you won't need to apply one unless you scuffed through to bare metal on any part of the pieces...
Be sure to properly follow the directions of the coating you are using for proper cleaning, and prep work before spraying the coating. You will also want to use the proper clear/top coating after spraying the color coat, as the finish will easily scratch/lift with accidental contact...
The adhesion promoter should be used for coating the plastic or vinyl pieces before spraying the color coat. For the metal pieces, adhesion promoter is used to give the plastic/vinyl surface grip.
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