Experimental record: In less than 10 minutes, the concave surface the size of washbasin magically recovered.

When I sent the video of "mending dents with boiling water" to Bao, the person in charge of Hangzhou Ronghe Auto Repair, he immediately called back: "This is really feasible, but in our auto repair industry, this is a relatively primary method. Generally, dents are not repaired by boiling water, but heated by electric gun or solar energy. Compared with the former, the latter two methods are convenient, stable and fast. "

For Lao Bao, a senior auto mechanic with nearly 30 years of auto repair experience, repairing a sunken car body with hot water is nothing. But for the experimental effect, Lao Bao decided to test according to the method provided by netizens.

Wang Hongqiang is a senior technician in the maintenance workshop. He found a dismantled scrap bumper from the workshop warehouse, which was made of plastic and had a depression the size of a washbasin. In order to compare the effect, Wang Hongqiang also found a bumper made of iron castings, and the depression was about the size of a palm.

Before the experiment began, technicians prepared a bucket of boiling water with a water temperature of about 90 degrees Celsius. Subsequently, Wang Hongqiang put the plastic bumper on the platform, and then heated the concave part of the bumper with a water spoon.

Heating with hot water requires a process, and only when it reaches a certain degree of heat can the material become soft. After about 5 minutes, the concave part of the bumper changed and the size of the concave gradually became smaller. The maintenance master struck the iron while it was hot and pushed it from the inside out until it fully recovered.

Look at the time, the whole process took 10 minutes.

However, no matter using hot water, electric gun or solar energy, it is impossible to dent the iron bumper, and the effect is not obvious.

Auto mechanic: Not all situations apply. It depends on the material and whether there are cracks.

"At present, most of the front and rear bumpers of family cars on the market are made of special plastic materials. Boiling water can repair the sunken car body. There is a simple reason. Plastic will soften when heated, and it can be sprayed out in the concave part as long as it is heated. " An auto repair technical expert from an American 4S shop said.

This principle is actually equivalent to putting a sunken ping-pong ball into hot water, and it will become round again after a while.

However, experts also said that this method will not work if there are dents in iron or aluminum cars. "For the repair of metal materials after deformation, it is obviously not feasible to use boiling water. Different repair methods should be selected according to the degree of deformation, such as automotive sheet metal plastic surgery machine. " Experts also said that if the bumper cracks, this method is not feasible.