Bird droppings and organic matter can damage car paint.
First, we need to find out which behaviors hurt the car paint. Zhang Fang published a paper "Research on Maintenance Methods of Automobile Paint" in the magazine "Automotive Practical Technology", which said. Car paint is composed of high molecular polymers, such as amino groups and hydroxyl groups. Organic substances in the environment, such as road asphalt, bird droppings, shellac, etc., will react with each other at suitable temperature and humidity.
It will cause these things to stick to the car paint, which is difficult to clean, and finally hurt the car paint. In the local dialect, it is called "eat it, eat it in paint". For example, the car was parked under a tree and was "fried" by bird droppings. I left it for a week before I finished it, but it happened. They were all beaten to death and stuck to it. Even if the back is washed away in the end, there will still be some color difference in that place.
Washing the car irregularly will damage the paint.
In addition to bird droppings and asphalt, some operations in car washing may also hurt the paint if you don't pay attention. Although the car paint has good weather resistance, its hardness is actually not high, and it is still easy to be scratched. Jiang Weibin of Central South University has a master's thesis "Development of Automobile Varnish", which says that this kind of automobile varnish has to go through a series of performance evaluation tests.
Although the requirements related to exposure and aging are relatively high, the hardness test is carried out according to GB/T 6739- 1996 "Pencil Method for Measuring the Hardness of Paint Film". This test uses Zhonghua brand advanced drawing pencil with a load of 750g, slides on the paint film, and then observes the scratches on the paint film. Judging from the Mohs hardness table, the Mohs hardness of pencil tip graphite is actually only 1 to 2.
The Mohs hardness of our nails is higher than that of graphite, not to mention the common stones and particles in nature. The Mohs hardness is 6 to 8. Therefore, when washing the car, if the car towel and sponge are not cleaned, there will be some foreign objects and sand particles left on them, which will rub back and forth with the car paint, and it is easy to leave scratches on them. Basically irreversible.
Wash the car every week 1 time, and wash the car by fate, which may damage the car paint.
Judging from the two kinds of car injuries mentioned just now, in fact, washing/kloc-0 times a week, or using it while washing, may be harmful. If you wash it/kloc-0 times a week, the bird droppings and shellac can be cleaned up in time, with little impact and no damage to the car paint, mainly because the regulations for washing the car every time are not standardized.
If there are pebbles on the towel sponge, as I just said, after washing it in another car, bring it directly to our car, and you will get 1 scratch every time you wash it. Why don't you wash it? If it's car washing, it's the other way around. Because of less washing, even if the towel is not very clean, there are still fewer scratches, right?
However, organic substances such as bird droppings and shellac may stick to the car for longer. Even 1 and 2 months have not been cleaned. Well, it's been a long time, and it's all integrated with the car paint. If you insist on which one hurts the paint surface more, the probability of washing the car with the edge is greater. Because compared with scratches, the damage caused by bird droppings and shellac is more difficult to repair.
In the journal Modern Coatings and Painting, a paper "Damage Analysis and Painting Repair Technology of Automobile Paint Surface" was published, which said. Friction in use and improper daily care will produce scratches on the paint surface, which is more obvious in the sun. In the local dialect, it is "sun pattern", which is round.
But this kind of scratch can at least be solved by polishing, and it will be glamorous after grinding off a layer, right? Bird droppings, shellac and asphalt are called "corrosion marks" of car paint, which means corrosion marks. Only slight corrosion marks can be polished, but most of them need to be repainted.
You see, irregular car washing is like a flesh wound, right? Bird droppings, an organic substance, not only causes flesh wounds to car paint, but also leaves a light scar, which may even cause internal injuries. Therefore, if you don't care about bird droppings and shellac, it's better to wash them regularly.
How to avoid damaging car paint
However, in fact, these car paint injuries can be avoided by some methods. For example, a friend who washes/kloc-0 times a week is worried that this towel is used by 10 thousand people in the car shop, right? Can I buy a new one for myself? Prepare two better towels, tens of dollars, which is similar to the cost of washing 1 car. Some bosses wash their cars for 200 to 300 yuan, right?
Can I use it many times? Moreover, the car paint was scratched when washing the car, and the whole car was polished. After a few hundred words, the car paint became thinner and could not be polished indefinitely. It's a good deal to buy towels, right? Friends who wash their cars at will should pay more attention to not stopping in strange places, right?
Look at it, there are no trees, bird droppings or shellac at all, which is easy to touch. Once you see it, melt some water and wipe it off. This is possible. You follow your fate, but wash it first when you see bird droppings and shellac, right? It's really troublesome. I really don't have time to take care of the car and sleep. There is only one parking space under the tree.
Cover your car when you park. Buying online costs tens of dollars, which is much cheaper and more convenient than repainting your car. If the parking environment is really unsatisfactory, I am really busy. If you want to clean bird droppings and shellac more easily, you can do it yourself after each car wash and coat the car with a coating agent.
Just like some mobile phones and computer screens will be coated, cars don't, so we can paint them ourselves. If you encounter bird droppings, just wipe them with a wet towel without hurting the paint.