GMH engine bays were painted with black slops/slush it wasn't gloss or satin although it can come across being either.
The paint is basically GMH chassis black and any slops that were returned to the pot (all colours) so the colour can vary from black to grey, shiny to dull.
Cars yards would clear coat to tart things up for sale (even new cars). Typically this clear coat was straight over the top of everything (hoses and all).
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