Corrosion is the main enemy of any car, especially in harsh climates where roads are generously treated with aggressive reagents. Ignoring the protection of metal surfaces leads to rapid body collapse, reduced safety and a significant drop in the market value of the vehicle. Self-processing of the bottom is not only a way to save budget, but also a guarantee of the quality of the work performed, because you control each stage of the process.
Many owners mistakenly believe that factory protection is eternal and does not require attention. However, over time, the factory coating becomes thinner, chips from stones appear, and moisture begins to contact the metal freely. Anti-corrosion treatment This allows you to create an additional barrier that will prolong the life of your car for many years.
In this article, we will discuss the application technology in detail. bitumen-polymericIt is considered one of the most effective and affordable means of protection. You will learn how to properly prepare the surface, what tools you will need, and how to avoid common mistakes that can nullify all efforts.
Choosing the right anticor for the bottom
The first and most important step is to find the right material. The market offers many options, but for processing the bottom with their own hands, asphalt or rubber-based formulations are best suited. These materials have excellent adhesion and after drying form an elastic film that does not crack under vibrations and temperature changes.
It is necessary to distinguish between penetrating compounds (often called "hammer" or oil) and hardening mastics. The first are good for hidden cavities, as they are liquid and displace moisture. Second, that is. masticThey are designed specifically for open surfaces of the bottom, creating a strong mechanical layer. Using the wrong type of material may result in the protection not fulfilling its function.
Why not use the βworkoutβ?
Using used motor oil as anticores is a popular but dangerous myth. The oil does not dry out, has an unpleasant odor, is easily ignited and washed away with water, leaving the metal unprotected. In addition, the pair of oil can penetrate into the salon, which is harmful to health.
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When choosing, pay attention to the presence of additional components, such as corrosion inhibitors and reinforcing fibers. Inhibitors chemically stop the oxidation process, even if moisture gets to the metal, and the fibers increase the strength of the coating, making it resistant to gravel impacts.
Required tools and materials
For high-quality processing of the bottom, it is not enough just to buy a can with mastic. You will need a specific set of tools that will ensure the correct application and durability of the coating. Lack of the necessary equipment often leads to an uneven layer and skip of areas where rust will continue to develop.
The main tool for applying thick mastics is a spatula or a special brush, but for large volumes and hard-to-reach places it is better to use it. gravel-gun Or spray gun. If you plan to use aerosol cylinders, make sure that their number is calculated with a margin, since one cylinder is only enough for a small area.
- π οΈ Tools: drill with a metal brush-nozzle, spatula, rags, paint scotch, plastic film for sheltering.
- 𧴠Chemistry: degreasing agent (white spirit or specialized cleaner), rust converter (if there are foci of corrosion), mastic itself.
- π‘οΈ Defense: Respirator, safety glasses, gloves, clothes that are not sorry to get dirty.
It is important to prepare the work area. The treatment should be carried out in a well-ventilated area, such as a garage with open doors, or outside in dry weather. The ambient temperature must be in line with the manufacturer's recommendations, usually between +10Β°C and +25Β°C.
Use paint tape and film to thoroughly paste the exhaust system, brake tubes and suspension elements. Getting mastic on brake discs or calipers can lead to jamming of brakes and emergency situation.
Preparation of the bottom surface for treatment
The quality of surface preparation determines 80% of the success of the entire operation. Applying mastic on a dirty, wet or rusty bottom is useless - the coating will simply peel off after a short time. The process of preparation is laborious, but it is absolutely impossible to ignore it.
The first thing to do is wash the car thoroughly, removing all dirt, clay and residues of reagents. It is best to use a high pressure washer to wash the dirt from the hidden cavities of sparrows and arches. After washing, the bottom should dry completely, otherwise the moisture will remain under the layer of mastic and start the corrosion process.
The next step is mechanical cleaning. With a drill with a brush nozzle or scraper, remove the flaking rust and the old, swollen coating. The metal must be cleaned to shine at the sites of damage. If the rust is deep, it is advisable to treat these areas rust converterThis will turn iron oxides into a stable layer.
| Preparation phase | Tool. | Purpose | Quality criterion |
|---|---|---|---|
| Washing | High-pressure wash | Removal of dirt and salts | Clean surface without visible contamination |
| Suit | Heat gun or time | Moisture removal | Complete absence of moisture in metal pores |
| Cleanup. | metal brush | Removal of loose rust | Metal-cleaned area |
| Degreasing | Mulch and solvent | Oil removal | The rag remains clean after washing |
The final step of preparation is degreasing. Wipe the entire surface with rags soaked in a white spirit or a special degreaser. This will remove the oil film and provide maximum adhesion (adhesion) of the mastic to the metal. After degreasing, you can no longer touch the surface with your hands.
βοΈ Training checklist
The bottom is completely washed and dried
Rust stripped to metal
The surface is defatted
Related parts (exhaust, brakes) are closed with film
The temperature in the room is normal
Technology of applying mastics with their own hands
The process of applying mastic requires accuracy and patience. If you use a single-component composition, mix it carefully before starting work. Two-component mastics require mixing the base and hardener in strictly defined proportions specified in the instructions on the package.
The material should be applied in layers. The first layer is often made thinner so that it penetrates well into the microcracks and pores of the metal. Do not immediately create a thick "coat" - this can lead to uneven drying and sliding of the material. The optimal thickness of one layer is about 0.5-1 mm.
β οΈ Attention: It is strictly forbidden to apply mastic on hot elements of the exhaust system. The material may ignite or start to smoke with the release of toxic substances. The exhaust system must be closed with heat-resistant screens or thoroughly isolated.
The second and subsequent layers are applied after the previous one is partially dryed (the time "drying on the stick" is specified by the manufacturer). Cross-application (the second layer is perpendicular to the first) helps avoid skips and creates a uniform coating. Pay special attention to welded seams, edges of arches and places of attachment of aggregates - it is there that corrosion most often begins.
Krascopult
Aerosol balloon
I'll call the service.
Not yet.
Treatment of hidden cavities and arches
The bottom of the car is not only flat surfaces, but also complex hidden cavities of spars and rapids, as well as wheel arches. It is in the arches that the concentration of moisture, sand and reagents is maximum, so their protection should be paid special attention.
For processing arches, special compositions with increased elasticity and rubber crumb content are often used, since it is here that most stones fly. Before applying the arch, it is necessary to thoroughly clean and degrease. Access to hidden cavities often requires drilling process holes through which a spray tube is inserted.
Use of the anti-gravel in the arches creates a rough layer that extinguishes the impacts of particles of the road surface. It is important not to overdo the layer thickness in places where it is possible to frictize the wheels or suspension elements, so that the mastic does not break off in pieces during operation.
When working with hidden abdomins, use flexible spray nozzles with a spray radius of 360 degrees. This will cover all the internal walls. After processing, the holes are closed with plastic plugs, which are also desirable to seal.
The main difficulty of processing hidden cavities is to ensure uniform coverage without passes, which is impossible without special equipment and flexible attachments.
Drying time and drying of the coating
After applying the mastic, the polymerization process begins. The drying time depends on the type of material, the thickness of the applied layer, the temperature and humidity of the environment. Usually, primary drying (when the surface stops sticking) takes 12 to 24 hours.
Complete drying and a set of final strength can last up to several days. During this period, it is not recommended to operate a car, especially in wet weather or on dirt roads. The ingestion of water or dust on an undried suit will spoil the appearance and properties of the coating.
To speed up the process, you can use infrared drying or heat guns, but you need to direct the flow of hot air carefully so as not to boil the material. Natural drying in a warm garage is the safest and most reliable option.
β οΈ Attention: Do not attempt to accelerate drying with open fire or excessive heating. Bitumen and polymeric compositions of fuel, and violation of the temperature regime can lead to fire or damage to the coating (blowning, bubbles).
Common errors in self-processing
Despite the apparent simplicity, beginners often make mistakes that reduce the efficiency of processing to zero. Understanding these mistakes will help you get the job done the first time.
One of the most common mistakes is applying mastic to wet metal. Water trapped under the sealant layer continues to destroy the metal, and the corrosion process is even more active, since oxygen access is limited, but moisture is present. Always make sure that the surface is completely dry.
Another mistake is saving on preparation. Attempting to apply mastic over loose rust without sweeping and converter will cause corrosion to continue under the coating. Mastic is a barrier, not a cure for deep corrosion without prior preparation.
- β Ignoring degreasing: It causes the film to peel off.
- β Too thin a layer: It does not provide adequate protection against attacks.
- β Exhaust system protection: They forget to close the silencer, which leads to fire.
- β Temperature disturbance: application to cold metal or in frost.
It is also worth mentioning the mistake of choosing a season. Treatment is better carried out in the warm season or in a heated room. Attempt to process the bottom in winter in the cold is doomed to failure: the material will not lie flat and will not polymerize correctly.
How often should I update the antiquities?
High-quality mastic treatment lasts from 3 to 5 years. It is recommended to carry out annual preventive inspection of the bottom. If you notice mechanical damage or chips, they need to be locally cleaned and greased, without waiting for a full update of the coating.
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Frequently Asked Questions (FAQ)
Can I apply mastic on top of the factory anticor?
Yes, you can, but only if the factory coating is intact, does not peel off and does not have deep corrosion. The surface must be thoroughly washed, dried and degreased to ensure the adhesion of the new layer. If the factory anticor is swelled or covered with rust, it must be removed mechanically.
What is better to apply mastic: brush or spray gun?
With a brush or spatula, it is easier to control the thickness of the layer and work with thick compositions, but the process is slow. Krascopult (especially pneumatic) allows you to quickly process large areas and hard-to-reach places, but requires diluting the mastic to the desired viscosity and thorough washing of the tool after work.
Do I need to remove wheels and slats for processing?
For high-quality processing of arches and hidden cavities of thresholds, the removal of wheels and plastic under-platforms (lockers) is extremely desirable. This will open access to areas that are normally closed and allow material to be applied uniformly throughout the arch.
Is mastic dangerous to rubber elements?
Most modern bitumen-polymer mastics are rubber neutral after drying. However, aggressive solvents used for degreasing or diluting can damage rubber seals. Therefore, it is important to use recommended solvents and avoid them getting on rubber suspension parts.
What is the thickness of the layer considered optimal?
The thickness of the dried layer in the range of 250-300 microns (0.25-0.3 mm) is considered optimal. A layer that is too thin (<150 ΞΌm) can be pierced by a stone, while a layer that is too thick (>400 ΞΌm) can dry for a long time and be prone to peeling off under strong vibrations.