It would catch the leaves and twigs of the street trees when you pass, and glancing a small stone running through the mountains, and that would damage the paintwork with sand in car washing. Car cannot be avoided by all means. Small scratches would cause painted surfaces, It could decrease the gloss.
The paint can cover the scratch, it is necessary to to deal with, such as to make it invisible. The effort would take time. It is the thing you want to reduce the scratches as much as possible. If you use something of glass fiber and glass compositions in coating like glass coating, It can soften the scratches because it is thicker than those of the other compositions. The notation H that of pencils has been referred to the thickness of coatings. The coating is usually as hard as 2H or 4H of the pencil hardness.
About 6H is the standard in the glass coating to it. The hardness can be increased to the 9H. For hard coating, the scratches hardly stick to the painted surface. It will protect the paint because the dirt is easy to slip off when you do glass coating, you can wash the car in the water everyday. But there is no need to rub with a sponge with car wash shampoo. Therefore, dust and iron powder were forgot during the car washing. And we do not have to worry about the small scratches. Who want to keep the car clean, please also consider options to perform the coating of the glass composition.