Don't worry about getting them sprayed, just buy some black badges from a trader on here called Asad I got chrome z burgers as I wanted a bit of contrast with the black. You can find the badges here
http://www.350z-uk.com/topic/81816-chrome-silver-350z-z-emblems/
http://www.350z-uk.com/topic/81823-super-black-z-emblem-set-front-and-rear-with-350z-lettering-emblem/
I'm based in Barkingside, East London