I recommend the following:
1. Take off the emblem
2. Use a dremel on the back side of the emblem and pop the letters "GMC" letters out
3. Plasti-Dip the chrome (all of it, that way you don't have any edges that can snag)
4. Use glossifier (If you want a glossy finish)
5. Put the letters back in (I used 3m automotive tape)
Take your time, you'll be much happier with the results.
Also, I attached my first attempt, which was without popping out the letters. I peeled it off and redid it. I have been through the automatic wash about 10 times now with no issues.