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First time I've seen under your bonnet mate, very tasteful and tidy.I painted my cover with acrylic while I was touching up the front spoiler. Simply rubbed back, undercoat, rubbed back then acrylic colour and clear. No probs with paint peeling -v the plastic cover doesn't get hot enough. Details were just hand painted.
It would look a lot better if the rocker covers matched but I don't have a spare pair laying around.