I've done this on some interior parts on the Suzuki. It lasted between around two weeks, and the bits where I got too enthusiastic and melted a bit lasted longer, but ultimately still went back to grey after a month or so.
Professional grade plastic dressings are easier to apply, safer and last equally long (and possibly longer).
I also tried this on the wiper cowl on a Mercedes and it didn't change colour, just melted!
!Not recommended/ proceed with caution!
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