Undercoating is a waterproof coating applied to cars' undersides to prevent them from rusting. The parts under your car are also vulnerable to damage from the elements (especially in north climates), oil, tar, and items that fly up from the road.
Short answer, NO you do not NEED undercoating.
It will depend on how much undercoating you are wanting to rubberize.
No.
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according to the info i read on the back of my can of undercoating, it only takes 10 minutes. I'd give it a 1/2 hr myself.
No, undercoating should last for years.
Maybe so you can see where you need to patch it up... maybe...
you can if you want to but i would not susgest it because then you will have problems under the car and no one will touch it
Yes. However, if you have surface rust, it should be removed before the undercoating is applied.
undercoating keep vehicle garaged when not in use move to Arizona, USA
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Under painting, or undercoating, is a coating added under the vehicle. It helps keep the underside of a car from rusting, and is especially helpful in snow or beach areas.