wheels are super easy! One deck of 3x5 cards, or playing cards, super clean the wheels first, tape off the valve stem and go for it! (don't forget to place cardboard underneath before you spray). I didn't even do more than one quick coat inside and then used 3 or 4 coats on the outside of the wheel. Just don't do too much, too fast. Several quick coats will look much better than trying to lay down too much product at once. (I ran my first wheel because I wanted full coverage on the first coat).
I left 4 super black circles on my grass that stayed for a week or so because I didn't lay down cardboard.