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I'm afraid I didn't do any prep' at all. Just sprayed one end of a 'lead-in' border to see if it would work. Left it overnight, compared it to a factory black moulded item and I couldn't tell the difference, so sprayed the rest of it. Time will tell on duability but the paint does seem well bonded to the plastic.

However, on the strength of that one test piece I have gone ahead and bought the sand coloured borders I need off eBay. I see some spray painting in my future!