I did my heater case, core support, wheel wells etc. in Duplicolor low gloss black engine enamel and it holds up very well.
i don't have any pics of my box on the pc but in my opinion sem hot rod black is the perfect sheen,if you want it in a spray can try sem euro trim black SATIN.
i use rattle can bedliner available at most part stores, tough as nails, low sheen, nice crinkle finish
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