I've plastidipped four MINIs and used the black stuff on lots of things. I wanted to love it but I think it really is designed to go over large painted surfaces, and the spay cans just suck really bad. I still have 75 dollars of product unused in my office. Here are my notes:
1. You will need two cans to do a MINI's side panels.
2. I don't recommend the BLAZE colors as they have big issues which are well documented.
3. Plastidip overspray is very messy too so be careful where you spray.
4. It is anything but easy to remove from a S4 MINI panel. Those vents...
5. It is very hard to get a nice application because of the vents on the MINI. You will get this horrible fuzz build-up you need to fix.
6. Do the inside of your panels first.
7. Light coats, but you need to build them up like crazy. It takes a long time to get a finished application of Plastidip.
8. The glossifier/sealer really changes the look and feel but does make it a bit more durable. They are expensive though.
9. Many people mod the spray tips because the ones Plastidip uses suck really really bad and stop working halfway through a can on some colors. Black works differently for some reason.