Woow! Zaino works great with dark cars. I love black cars and this is my 3rd black cars in a row now. All have zaino on it.
http://www.clublexus.com/forums/showthread.php?t=226367
It's not that hard to use zaino. Dawn wash it, then claybar, and dawn wash it again and dry. Then you are ready to go with Z5 and Z2. You can put as many layers are you want, and just have to make sure end with Z2 due to its reflective property. I've tried everything else but I love zaino the best.