that all depends on the bullet & distance of the shot.
small to midrange caliber LEAD bullet can be stopped by 1/4 inch steel (or thinner) from SHORT distance.
2. But if you find such a metal, the tank makers would like to know.
I do not know of any spray products that make a car bullet proof, but there is bullet-proof plastic that form to fit the window type of a certain car, and some bullet proof glass.
Any age. Idiot.
It depends on where you are. In the U.S. there is no requirement of a license to own a bullet proof vest by federal law, and most states have no requirement for it. It is illegal to wear a bullet proof vest during the commission of a crime, and felons can't own bullet proof vests (I can't recall if that's state or federal laws), but otherwise, anyone can buy a vest.
The same as any metal.
Generally speaking, no. Not any more than any other car.
That depends on what you like. There are bands like "Bullet for my Valentine"
TMJ's can be fired from any gun that is in the same caliber as the bullet.
Not any more than any other product you may have. Bullet proof vests are legal to own in the U.S. unless you are a felon (in some states) or are using it while committing a crime. Generally speaking, you don't have to keep proof of products you have bought on you, and the only reason you should have a problem is if an officer thinks it's stolen for some reason.
Yes. Any car can be. It depends on how much you're willing to pay and how much performance you're willing to sacrifice. The question is, why would you want to bullet proof a Toyota Corolla?
No. Does your friend have any proof?
No, titanium is not considered poisonous. It is a safe and biocompatible metal that is commonly used in medical implants and surgery tools due to its non-toxic nature. However, like any metal, excessive exposure to titanium dust or fumes may cause respiratory issues in some people.
At any police/security equipment dealer, or possibly as a military surplus military item. Check your local Yellow Pages.