In what way? because they have 8 holes in the centre?!
Tyre shined the tread? Surely that is dangerous
How exactly? no worse than a wet road, and it will wear off after 10 odd rotations on the tarmac.
cars dont rely on the side walls of the tires to balance were as bikes do .I watched a program recently where a motorbiker died when he lost control of his bike on a corner. He wasn't going fast. Turns out it was because he had used tyre shine on more than just the sidewall which reduced his grip.
Maybe different in cars I guess