Master class on polishing cars with 3M pastes
Currently, in stores you can find a lot of different products designed to polish the car body. Next, do-it-yourself polishing work using pastes from the well-known 3M company will be considered.
Car body polishing is performed in order to increase its external attractiveness by giving shine to the paintwork for new cars and also removing its minor defects for cars in operation. Since the technology of these works is quite simple, in addition, you can find educational articles and videos, it is advisable to polish the car with your own hands in order to save money on the salaries of specialists.
By appointment, polishing the car body is divided into three types:
- Restorative processing is performed on a car with a damaged paintwork. It should be borne in mind that in this way only small scratches that do not reach the ground can be eliminated. The technology of polishing a car of this type includes two stages: removing the top damaged layer of paintwork and polishing. It should also be remembered that there is a limit on the number of repetitions of this procedure. The paintwork of a car without violating its integrity can be polished up to 20 times.
- Protective polishing is relevant for new cars. It is divided into superficial and protective. The first type of polishing is usually performed before sale, which gives the car a low protective function. The second type of work is much more efficient. Basically, it is designed to protect the paintwork of the car from atmospheric precipitation.
- Soft polishing is used for older cars with intact paintwork. This technology is considered as a simplified version of protective polishing.
Equipment and materials
To polish the car body with your own hands, use a tool such as a polishing machine or a drill with polishing wheels. Consumables are also required, represented by foam rubber, applicators, baize or flannel, P1500 and P2500 sandpaper, polishing compounds, and rags. In addition, you will need a rubber scraper and a spray gun.
As for polishing compositions, there are several types of such materials, which differ primarily in abrasiveness. They are chosen based on the polishing method. Further, these compositions are considered using the example of 3M products:
- 3M Perfect-it III. This non-abrasive polishing paste is designed for cars with minor damage to the paintwork, such as streaks or dullness. According to the manufacturer, the effect of this composition is most pronounced when processing dark surfaces. It is designed for application with polishing wheels.
- Polish "ROSE". It is a protective compound. With this paste, you can polish a new car in order to protect its paintwork. It is designed for application after washing with a cloth or a grinder with a polishing wheel.
- 3M Fast Cut Perfect-it III. This abrasive composition is designed to remove fine scratches after a grinder, as well as to process both new and old paintwork. This paste should be applied with a polishing machine.
- 3M "Ultrafina". This polishing composition is used for processing the car body after rough polishing, as well as for polishing both new and old paintwork. Such a paste is designed to be applied by a machine with a polishing wheel at 1000 - 2500 rpm.
Execution of works
In order to properly polish the car body with your own hands, you must first prepare it. Preparation consists, first of all, in the complete cleaning of the car by washing with detergents and solvents. In addition, you should choose a room. Moreover, it must be equipped with ventilation, since car polishing produces a large amount of dust. In addition, good lighting is essential. Lighting devices should be placed around the car at five points. If polishing outdoors, you need to choose suitable weather conditions: it should not be sunny, not wet, not cold and light.
The technology and duration of polishing is determined by its type. The following describes how to polish a car with your own hands using the recovery method, as the most difficult.
These works are complex, that is, they include several stages of polishing with pastes of various abrasiveness. The process begins with the elimination of scratches of large and medium depth by wet sanding with sandpaper. This abrasive material is pre-cut into small fragments and soaked in water. The latter softens the sandpaper, so that it will not leave rough marks. During the grinding process, water and material residues are periodically removed with a scraper. First, the body is treated with P1500 abrasive material, and then they switch to P2500 sandpaper.
Then they start working with a grinder. Individual parts can be processed by hand, but in the case of polishing the entire body, you should work with a power tool. A device with speed control is required, since each stage of work must be carried out at a certain speed of rotation of the working element. Start with the most abrasive white circle. The work is carried out by wet grinding at 900 rpm, covering the circle with abrasive paste, also selecting the appropriate level of abrasiveness. The tool is moved along the working surface smoothly, but not delayed for a long time in one area. Particular care must be taken when handling corners and edges. It is more convenient to polish with fragments of the body, that is, details. Upon completion of polishing one of them, it is wiped with a rag and moved on to the next body element. In the process of processing, you need to monitor the presence of paste on the working element and water on the working surface. In case of overheating of the part, polishing is suspended to cool or water is sprayed onto it.
Upon completion of the work, the car is washed. The results of polishing will be visible after it dries. Then you can proceed to protective polishing. The technology of work is similar to that described above. The differences are that in this case they work with non-abrasive pastes and without water. If polished exclusively by this method, the car must also be cleaned first. Upon completion of the work, you should check how correctly they were carried out by applying water. If the car is polished properly, water will collect in droplets on the surface of its body.
It should be borne in mind that after painting the car can only be polished after two months. This is due to the fact that during this period the polymerization of the paintwork takes place, and the solvent comes out of it. If you polish the car earlier, the composition will fill the pores, as a result of which the coating will soften and age quickly.
Inexperienced users, before polishing with their own hands, should read the tutorial articles and videos to get the job done right. On the net you can find text and video materials on any type of polishing.