IMO no. It is a waste of money on modern cars that are rustproofed at the factory. The body will outlast the drivetrain.
When you are buying a new car you will need to have the following documents with you, your drivers license and proof of insurance. You should also be ready to provide proof of income if this is the first time you are buying a car.
If you are new to the concept of car rust, http://www.dummies.com/how-to/content/how-to-protect-your-car-from-rust.html is a great article on a beginner's guide to it.
if youre talking about any peice of melt such as a BOLT or anything like that (small) you can use lime juice and rust will come off. let the metal sit in lime juice for a while and then clean off. rust should be gone. if youre talking about a car you should cut or saw peice of metal where car is rusty at and weld in a new peice of metal. simple but will take long.
they are missle proof i believe
NO. Only new cars should be undercoated. Unless you feel like ripping apart the car cleaning all the rust off then you could, but it is too much work. The above answer is kind of stupid. The poster asked if a used car could or should be undercoated. If the car in question has rust peforation or is obviously rusted (and rust is easy to see and inspect for) then obviously the answer would be a solid "no". However, a used car that is CLEAN and well kept, has no rust issues, can be steam cleaned and undercoated. I have a 22 year old pickup truck that was purchased new in Hawaii, and soon thereafter called SE Arizona home until the past week or so. This truck has absolutely NO rust on it, and it can be cleaned and undercoated prior to it's first OH winter. SO the qualified answer is: If the vehicle is CLEAN, has been well maintained, or is from a rust-free environment, it can be undercoated.
It forms a new substance.
by giving your Proof of Residence address and register it.
To register a car in New Jersey you need Certificate of Title Proof of New Jersey insurance Proof of your Social Security number or exemption The current odometer reading Your driver's license or, if you don't have a New Jersey license, appropriate identification. So no you cant register a car in NJ without insurace.
If it is brand new - no. But - things do go wrong for whatever reason. New car should have a warranty.
Surface rust isn't dangerous, cancerous rust on the frame can be dangerous because the car could snap in half depending on the extent of the rust. The best solution usually is just to get a new car because the frame usually isn't worth fixing. In my state they consider it dangerous because if you get stuck in snow they fear exhaust entering the cabin and killing its occupants. Rust holes of any kind will fail your inspection.
To register your new car, you will need to visit your local Department of Motor Vehicles (DMV) office. Bring your proof of ownership, such as the vehicle title, proof of insurance, and a valid form of identification. You will also need to pay the registration fees and any applicable taxes. The DMV will issue you license plates and registration documents for your new car.
There is no fool proof way. Get a new battery if putting it on a slow charger does not work.