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Another good choice is SEM in aerosol which would be more than adequate and I'm with mbullock about using all of those steps to insure your paint adheres correctly.
Yes sem had some really nice aerosol factory pack colors. I have the order numbers for those somewhere. If I can find it, I'll post it. I know those can be had on eBay.
Yes, primer/sealer, should always be allowed prior to color to ensure true adhesion. Ever notice the crown vics/ grand Marquis of like 07-08 peeled horribly? Ford applied color straight to e-coat with no sealer. Huge problem for Ford
For my 2013 I bought 2011 badges that come black and bright red from the dealer and they also come apart to ease the painting process. Repainted them Ruby Red and a less shiny black. Also, for contrast I had the FX4 logo painted silver. All it took was a light scuff with a scotch bright pad and paint. Automotive grade paint was used.