I'm sure they were put on after the body shell came back from being welded together. Then as they went down the line certain workers knew what the car needed to have. They would have just been painted on the car when the engine bay was painted.
Black had no clear in the engine bay, so the paint was thin layer of satin/semi-gloss black.
I'm gonna try to replicate that on my car. Gloss black engine bays just don't look right to me.
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