I love this stuff! I applied these to my tires and they have been shiny for 7 days! And it rained the first 2 days (because that's what happens when you wash your Explorer).
These come in a pack of 25 for around $4. I like it because you don't have to clean any overspray and it doesn't spin off the tires onto the body.
I even use it on my running boards! <-- not recommended for people who actually use their running boards.