OK, here are some tips that you might actually find find helpful:
1- Buy a 'comfort spray grip' (my rust-oleum brand one cost $6.98 from lowe's, http://www.lowes.com/pd_284850-90-241526_0__?productId=3078199)
The reason for this is to ensure that your 'trigger finger' remains smooth and consistent. If you are not used to spray-painting anything large or for a long time, your 'trigger finger' will cramp up - trust me.
2 - whether painting wheels off the car or on, you want very light even strokes (like 50% on first swipe, it will look wrong but trust me - prevents runs)
3 - you want at least (4) coats and really be sure work the outer edge of the rims (all the way around!!!) and get that coated thoroughly, as later this will provide a good thick base for peeling off in the future.
Understand that the thinner the coat, the harder it is to come off cleanly; sort of a paradox, a thicker coat means that peeling becomes easier when you want to but also provides a stronger base to fend off knicks that will attack your base.
4 - with you car in NEUTRAL (do not use brakes if you are using the trash bag method to protect calipers/rotors above - too risky having bag catch inside caliper), when done coating - roll back about 2-3 feet.
This will give you a different view of the wheels so you can make sure you hit the wheels with dip completely and not missed any spots.
Lowe's and HD do not carry the platidip gross, I verfied this today; Lowe's has black plastidip for $5.98 per can.
Happy dipping...