Hi I painted mine black after speaking with a few people on the forum, a guy from Africa & Jmo, i followed instructions regarding rubbing down and primers and best paint to use etc including consulting the local spray paint specialist, but regardless of how you do it and what you use there is the problem of the type of plastics used by Yamaha which will not allow proper adhesion of any type of spray paint, it will go on and in general its okay but if you scraped your fingernail across the top it will come off apart from the plastic piece located beside the exhaust headers this will take the paint properly and it doesnt come off when scraped by a fingernail, this is because this panel is made from a different type of plastic to no doubt deal with the heat from the exhaust.
Just do it and besides you just need to give it a spray over when its got a bit scraped.
Steve