Recovery of the paint coating of the car is a process that requires not only high-quality material, but also ideal adherence to the application technology. Even skilled craftsmen sometimes encounter a defect known as a shashaven, which visually resembles the skin of an orange. This phenomenon significantly reduces the aesthetic appeal of the body, making the surface matte and devoid of deep mirror shine.
The cause of irregularities is often a violation of viscosity. stain-paintIncorrect temperature in the paint chamber or too rapid evaporation of the solvent. Also important is the setting of the spray gun: if the spray torch is selected incorrectly, the drops do not have time to spread before drying, freezing in the form of microscopic bumps.
Removal of this defect is possible, but requires patience and the correct selection of abrasive materials. In this article, we will discuss in detail the stages of preparation, machining and finishing polishing, which will return your car to its factory appearance.
Surface diagnostics and scale assessment
Before you take on the grinder, you need to carefully inspect the painted part in bright side lighting. It is this light that allows you to see the real relief of the surface and determine the depth of defects. If the shaven is deep and feels like coarse sandpaper with your fingers, a more aggressive approach to processing will be required.
It is important to make sure that the paint coating is fully polymerized. Acrylic enamel They may appear dry to the touch after a few hours, but the healing process continues inside the layers. The start of work on insufficiently dried paint will lead to clogging of abrasive and the appearance of deep scratches, which will be extremely difficult to remove.
There is a simple test to check the readiness of the surface: run your nail over an inconspicuous area. If there is a trace or the surface is grinded, drying must be continued. For complete certainty, it is better to wait the time recommended by the materials manufacturer, usually 24 hours at room temperature.
Use a bright LED light pointed at a sharp angle to the surface to see the smallest bumps invisible in ordinary light.
The scale of work is directly influenced by the choice of tools. Local defects can be removed manually, whereas large areas such as the hood or roof require the use of a pneumatic or electric grinder with a dust removal system.
Necessary tools and materials for grinding
The quality of the result depends on the right toolkit for 80%. To work with acrylic coatings, you will need a specialized set that will ensure uniform removal of the layer without the formation of new defects. Using inappropriate materials can lead to overheating of the surface or the appearance of holograms.
The main tool will be a grinder with an eccentric course of 3-5 mm. This move is considered optimal for finishing work, as it minimizes the risk of creating vibrational risks. You will also need various types of abrasives, ranging from rough and ending with ultra-thin polished pastes.
☑️ Basic set for eliminating shavern
Don’t skimp on abrasive circles. Cheap materials are quickly clogged with the grinding product and begin to heat the varnish, which can lead to its clouding or even burning to the base. Quality paper-based abrasive Provides clean cuts and a long service life.
To protect neighboring parts that are not subject to processing, stock up on paint tape and cover film. The dust formed during the grinding of acrylic is very fine and penetrates everywhere, so the presence of a good vacuum cleaner and respirator is a mandatory safety requirement.
| Type of material | Gradation (P) | Appointment | Features of application |
|---|---|---|---|
| Waterproof sandpaper | 800 - 1000 | Removal of deep shavern | Only on wet, requires caution. |
| Abrasive circle | 1200 - 1500 | Surface leveling | The main stage of dry grinding |
| The polishing circle | 3000+ | Removal of mattress | Preparation for finishing polish |
| Abrasive paste | 1 micron | Recovery of the gloss | Final stage |
Wet and dry grinding technology
There are two main approaches to eliminating shaking: wet grinding (with water) and dry (using special abrasives). The choice of method depends on the hardness of the varnish and the personal preferences of the master, however, dry grinding is becoming more popular due to the purity of the process and the ability to better control the result.
With the wet method, the surface is abundantly wetted with water, often with the addition of a soapy solution for better sliding. This allows you to use more aggressive abrasives, such as the P800 or P1000, without fear of overheating. However, water can get into microcracks and cause corrosion of the metal in the future if the part is not dry perfectly.
⚠️ Warning: When grinding the edges of the doors, hood and trunk lid, work extremely carefully. The polish on sharp edges has a minimal thickness and is very easy to wipe to the base layer or metal, which will require repainting of the part.
Dry grinding is performed by P1200-P1500 abrasives on an orbiting machine. The movements should be smooth, without strong pressure. The tool itself must do its job under its own weight. Periodically stop and wipe the surface. degreaserto assess progress.
The purpose of this stage is not to remove the shavern completely, but to make it uniform. The surface will become matte, but homogeneous. Don’t try to achieve gloss at the grinding stage, it’s a polishing task. The main thing is to remove the differences in height between the "bulges" of acrylic paint.
Why not miss the gradations of abrasive?
If you switch from the P1000 to polishing, you can’t remove the deep risks from the thousands. You will have to work a long polishing circle, which will lead to overheating of the varnish and the appearance of holograms. Each step of the abrasive must cover the risks of the previous one.
It is important to observe the sequence of gradations. The transition from P1200 to P1500, then to P2000 and P3000 allows you to gradually reduce the size of the scratches. Skipping stages will make finishing polishing almost impossible or extremely time-consuming.
The polishing process and gloss restoration
After the surface has become evenly matte, the polishing stage begins. This is where the depth of color and mirror shine return. For acrylic paints, water-based polishing pastes are best, which are less aggressive and easier to remove from the surface.
Use a polishing machine with adjustable speed of rotation. Start with an abrasive paste and a hard foam or wool circle at medium revs (about 1200-1400 rpm). Keep the machine at a small angle and slowly move it along the surface without lingering in one place.
- 🔵 Apply a small amount of paste on a circle or directly on the body (about 3-4 pea-sized drops on a 40x40 cm element).
- 🔵 Ran the paste on the switched off machine, spreading it over the surface.
- 🔵 Turn on the typewriter and polish until the paste is almost transparent and the mattness disappears.
- 🔵 Remove the leftovers of the paste with a clean microfiber and check the result.
If after the first pass there were noticeable risks or the shavern appeared again, the procedure with abrasive paste should be repeated. Only after obtaining the perfect smoothness, go to the finish polishing with protective compounds with an anti-hologram effect.
The key point of polishing is to prevent the paste from drying out on the surface. Work in small areas (50x50 cm) and timely update the composition on the circle.
Common Errors and How to Prevent Them
Even following the instructions, beginners often make mistakes that negate all efforts. One of the most common is the use of dirty polishing circles. The hardened particles of old paste work like a large abrasive, leaving deep scratches on fresh lacquer.
Another problem is the overheating of the surface. Acrylic paint is sensitive to temperature. If you feel that the part is heated from the operation of the machine, stop immediately and let it cool. Otherwise, the varnish can become cloudy or "boil", forming defects that will have to be removed again.
⚠️ Warning: Never use household cleaning products or solvents (acetone, gasoline) to clean the surface before polishing. They can react chemically with acrylic, causing it to swell or change color.
The wrong choice of the speed of rotation of the polishing machine also leads to problems. Too high speeds create a risk of rubbing the varnish, and too low will not give the desired effect. The optimal range for finishing works is 1000-1500 rpm.
Ignoring cleanliness in the working area is the way to the appearance of new dust on an even sticky layer of polyrol. Work in a clean, well-lit room, preferably after wet cleaning, so that the settling dust does not stick to the polished surface.
Protection of the updated coverage
After successful removal of shaven and polishing, the coating becomes thinner, and therefore more vulnerable to external influences. To maintain the achieved result and protect the body, it is necessary to apply a protective layer. It could be quality. carnaubaSynthetic sealant or modern ceramic coating.
Applying protection is better to carry out 2-3 weeks after polishing, giving the varnish to finally harden and evaporate the residues of solvents. However, if the vehicle is to be operated immediately, a temporary protective layer must be applied on the same day.
Regular care will prolong the life of the paint coating. Wash your car with a soft sponge using pH neutral shampoos. Avoid automatic washers with hard brushes that can quickly return the shaking and cause new scratches.
Remember that the perfect painting is a combination of craftsmanship, quality materials and proper care. By eliminating the shaft, you will not only improve the appearance of the car, but also increase its market value.
Can I remove the shaver by hand without a car?
Theoretically, you can use a bar and water-resistant sandpaper, but it is extremely time-consuming and requires a lot of experience. The risk of creating a wavy surface ("lens") is very high. For large areas, the use of an orbital grinder is mandatory.
How long after painting can you polish?
Acrylic enamel is usually ready to grind after 24 hours at a temperature of 20°C. However, for full polymerization and safe polishing with a machine, it is better to wait 7-14 days, especially if the drying mode was not accelerated.
What to do if you wipe the varnish to the base?
If you see a base color or soil, grinding on this area should be stopped immediately. The polishing won't help here. You will need local paint base, varnishing the site and re-polishing the entire part to level the transition.