How to prevent car chassis rust

Is there any way to protect the chassis? "Chassis armor" is a feasible method to protect chassis at present.
"Chassis armor", as the name implies, is to equip the chassis of the car with strong armor. Professional chassis armor is to spray 3-5 layers of special anti-rust glue to the automobile chassis, the chassis and the noise parts above the hub are completely wrapped up, to be formed after natural consolidation of the chassis protective layer, can reduce the damage of sand impact, anti-corrosion anti-rust. In addition, the chassis armor can also play a better sound insulation effect. The dedication of "chassis armor" is unknown and rare to see, but after the chassis armor is finished, an obvious feeling is that the car becomes quiet.
"Chassis armor" is necessary for good cars. The domestic Audi and Passat cars produced by Mercedes-Benz, BMW and Volkswagen have relatively complete chassis protection measures when they leave the factory, so it is not necessary to make chassis armor for new cars. And like other cars below 150,000 yuan, especially domestic cars should be done.
Many mid-range, low-range cars leave the factory, manufacturers for cost consideration, the chassis treatment is very simple. Many cars have only a thin coat of underbody paint, and some models have only a partial coat. Under normal conditions, the rust prevention measures of the original factory can still play a limited role in protecting the chassis, but there are abnormalities can not be competent. For example, the Jetta chassis, which has been falling in price, has been left untreated, making it necessary to armor the chassis.
According to reports, chassis sealing plastic is a lot of owners familiar with the maintenance project, its main role is to protect the car chassis exposed steel plate gravel hit, anti-corrosion, but listening to the sound of gravel on the chassis, many owners are still very worried. In order to insulate the sand from the noise of the chassis, it is necessary to carry on the chassis armor. In addition to the two functions of sealing plastic, the chassis armor also has a significant effect of sound insulation and noise reduction, because the armored chassis formed a composite coating of rubber and polyester material nearly half a centimeter thick. The coating is highly elastic and effectively reduces the noise caused by the gravel hitting the metal directly.
In addition, the two construction thickness and physical composition are also different. The general sealing plastic is 2 mm thick, the main component is polyester material, and the chassis armor is a mixture of rubber and polyester material formula, the construction thickness is 4 mm, partial half a centimeter above. There is no conflict between making armor and sealing plastic. The protective measures are both, and the car owner can get double peace of mind. The price of armor is higher, with the market price between 1,500 and 1,800 yuan. The new armor will get twice the result with half the effort and the process is simple, so the price will be slightly cheaper. But for older cars that have never had chassis treatment, the price of chassis armor will be slightly higher.