OK, So, I learned a lot doing this and I thought I would share.
First of all, Plastidip comes in many different colors. Home Depot only stocks the Black, but you can order the white or other colors on line. It's $6 a can. You can plan on using about a can a wheel. The first time I did it, they bubbled and peeled. So I pulled it off and tried again. My rims are chrome. I first cleaned them with soapy water, dried them and then rubbed them down with rubbing alcohol and let it dry completely. Humidity in the air is a factor too. Be sure to do this on a nice day. You don't need to sand, or prep anything. My chrome was peeling on the back side. I yanked off the big pieces and rubbed em down with alcohol and they were ready to roll.
The first time I didn't mask them because it is generally really easy to peel over spray when it's dry. But, peeling rubber off rubber is not too easy. Especially when it's sprayed on thin around the edges. The thicker your spray, the easier to peel. The second time, I learned an swesome trick on youtube. As shown in the images, put index cards all around the edges. No overspray and easy to place in the edges of the rims.
The second image shows after the first coat, a real thin base. Wait at least 30 minutes in between coats. My second coat was a lot heavier, as each coat went on, I got a little heavier. I put on 5 coats and it looked great.
In one afternoon, I got all black rims and it only cost less than $30 to do it!
Prepped and ready
After the base coat
All done