The thresholds of the car are one of the most vulnerable areas of the body, which is the first to take on the blows of stones, sand and road chemistry flying from under the wheels. Daily operation, especially in winter, makes this area a hotbed of future corrosion, if not to provide reliable protection. Independent application of anti-gravel coating allows not only to significantly save the budget compared to the services of the service station, but also to be confident in the quality of the work performed.
The process requires careful preparation of the surface and compliance with the technology, otherwise the coating can peel off or, conversely, cause moisture accumulation under itself. In this article, we will analyze all the nuances of the choice of materials, tools for work and step-by-step algorithm of actions. Antigravium It is not just paint, but a complex polymer composition, which, when applied correctly, becomes an elastic armor for your car.
Many owners underestimate the importance of pre-treatment of metal, relying only on the decorative properties of the composition. But the main function of the material is corrosion-proofingIt works only in conjunction with the qualitative preparation of the base. Ignoring this stage can lead to the fact that after a year under a beautiful black layer you will find rust that has eaten through the metal.
Material choice: aerosol or bank
The first step before the start of work is to solve the dilemma: buy a ready-made aerosol cylinder or purchase a composition in a bank under a gun. Aerosol variants, such as Body 950 or Novol ProtectIt is convenient for local repair and treatment of small areas where accuracy is important. They do not require special equipment, but their consumption when processing the entire bottom of the body will be economically impractical.
The compounds in the banks are designed for professional use with a compressor and a spray gun. This approach allows you to regulate the pressure and the spray torch, creating a uniform layer of the desired thickness. Polyurethane and rubber Basics in the can version often contain more dry residue, which provides better cover and durability of the coating.
It is important to pay attention to the presence of thixotropic properties in the product description. This means that the material will not drain from vertical surfaces after application, but will retain a predetermined shape. For thresholds, this is critical, as the geometry of elements often has complex curves and faces.
⚠️ Note: Do not use cheap bitumen mastics to handle the outer parts of the sills. They do not have the necessary elasticity and under the influence of stones quickly crack, passing moisture to the metal.
Modern hybrid formulations can include zinc or aluminum particles, creating an effect. cathodic. This is an additional barrier that prevents the development of electrochemical corrosion even in case of mechanical damage to the upper layer. When choosing a material, be sure to read the manufacturer's instructions regarding compatibility with various types of soils.
Before buying a large volume of material, purchase one small package and test the adhesion and drying time on an unnecessary piece of metal.
Tools and workplace preparation required
The quality of the final result depends on 80% of the quality of the workspace and tools. To work, you will need not only the anti-gravel itself, but also a set of auxiliary tools. Ensure good ventilation of the room, as solvent vapors are toxic and the dust should not settle on the sticky layer.
The list of necessary equipment includes a compressor (if you work with a can), a spray gun with a duse of 2.0-2.5 mm, a degreasing agent, sandpaper of different grains and paint scotch. Also, do not forget about personal protective equipment: respirator, gloves and glasses. acetone or white-spirit will be needed for washing the tool and final degreasing.
- 🛠️ Compressor and spray gun (for compositions in banks)
- 🧴 Degreaser and rags without pile
- 📏 Sandpaper P80, P240, P400
- 🚧 Paint tape and cover film
- 🌡️ Drying hair dryer (optional, to speed up the process)
The workplace should be dry and warm. The optimal temperature for applying most formulations varies from +15 to +25 degrees Celsius. At lower temperatures, the material may lie unevenly, form a shaver or dry for a long time, which will lead to adhesion of dust.
☑️ Readiness for work
Technology of body surface preparation
Surface preparation is the foundation on which all protection rests. If you miss this stage, no, not even the most expensive. antigraviumIt won't hold on to the body. The first thing you need to thoroughly wash the car, paying special attention to the arches and the bottom of the doors. The salt and dirt must be completely removed.
After washing, a mechanical cleaning step follows. The old coating, if it peels off or bubbles, must be removed completely to the metal. Use a large sandpaper or metal brush. Rust must be cleaned to pure metal, and then treat these places rust converter according to the instructions on the bottle.
The final stage of preparation is degreasing. Wipe the surface with abundantly moistened rags, removing silicones, oils, and converter residues. Let the surface dry. It is important not to touch the prepared places with your hands, as skin fat worsens adhesion.
⚠️ Note: Do not apply antigravel to fresh rust converter if it requires washing off with water. The surface must be completely dry, otherwise hidden corrosion will begin under the coating.
To improve adhesion to cleaned metal areas, it is recommended to apply epoxy. It creates a chemical bond with the metal and serves as an ideal basis for subsequent layers. Acrylic soils are also permissible, but epoxy have better moisture protection.
Do I need to slap the thresholds before antigravity?
If there are dents or deep corrosion on the thresholds that require alignment, putty is necessary. However, you need to use a special putty for plastic or elastic compositions, since the thresholds are subject to vibration. A regular fiberglass putty can crack.
Anti-gravel coating process
The application process itself requires skill and distance. If you use an aerosol, the canister should be kept 25–30 cm from the surface and shaken every couple of minutes. When working with a spray gun, the pressure should be set in the range of 3-4 atmospheres so that the material lies evenly, but does not spray with fog.
Apply the material should be in 2-3 thin layers. The first layer may be slightly transparent (foggy), it serves as a bond with the surface. Subsequent layers are applied after a light drying of the previous one (usually 10-15 minutes). This technology avoids overshadowing and provides a uniform texture.
| Parameter | Aerosol cylinder | Krascopult (bank) | Brush/roller |
|---|---|---|---|
| Thickness of layer | Thin, hard to control | Adjustable, optimal | Fat, uneven. |
| Material consumption | High-pitched | Economical | Medium. |
| Texture quality | Big shavern. | Uniform shaft | Rough, pile marks. |
| Recommended application | Local repairs | Full body protection | Not recommended |
Pay special attention to the edges and transitions. To make the boundary between the treated area and the factory paint less noticeable, you can use the technique of "stuffing" or close the transition with paint tape, which is removed immediately after applying the last layer until the material has frozen.
The main rule of application: it is better to make three thin layers with intermediate drying than one thick one, which will dry for eternity and can slide.
Drying time and polymerization
The drying time depends on the ambient temperature, humidity and thickness of the applied layer. Surface film is formed quickly enough, usually within 30-60 minutes, which allows you to remove paint tape and remove cover materials. However, this does not mean that the car is ready for use.
Full polymerization of the material takes from 12 to 24 hours. During this period, it is not recommended to wet the car or go to the road, where dust and dirt may get on a sticky surface. Polymerization A chemical process in which a material gains its final strength and elasticity.
If you are working in the cold season, the drying process can be accelerated by using an infrared lamp or heat dryer, directing warm air at a distance of at least 50 cm. Dramatic heat can lead to bubbles, so act carefully.
- 🕒 Surface drying: 1 hour
- 🚗 Readiness for operation: 24 hours
- 🌡️ Ideal drying temperature: +20°C
- 💧 Contact with water: not earlier than 48 hours
⚠️ Warning: Do not attempt to accelerate drying with an open fire or a building hair dryer at maximum power. This can lead to ignition of solvent vapors or deformation of the coating.
Common Errors and How to Resolve Them
Even with the technology, defects can occur that are easy to fix if you know the cause. One of the most common problems is a peel too large or an “orange peel”. This occurs if the material is applied too thickly or from too long a distance, when the solvent evaporates in flight.
Another common mistake is poor adhesion, when the coating flakes off in layers after a short time. This is almost always the result of insufficient degreasing or application to a moist surface. In this case, you will have to completely remove the coating, clean the metal and start the process again.
If craters or “fish eye craters” appeared on the surface, then silicones or oils got on the fat-free surface. This can be eliminated only by a complete repainting of the site after careful grinding and re-degreasing with special anti-silicone compounds.
Can I paint anti-gravity on top?
Yes, most anti-gravel coatings (especially black and gray) can be repainted with acrylic or polyurethane enamels after drying completely (after 24 hours). This allows you to choose the color of the thresholds for the color of the car body.
Durability and maintenance of the coating
Qualityly applied antigravium It can last from 3 to 5 years or more, while maintaining its protective properties. It is resistant to salts, acids and alkalis that are found on roads. However, mechanical damage, such as deep scratches from branches or stones, can disrupt the integrity of the layer.
Care for anti-gravel coating is minimal: a normal car wash is enough. It is not recommended to use aggressive brushes with hard bristles on the thresholds, so as not to overflow the texture of the material. Periodically, the surface can be treated with protective polyroles for plastic and rubber to maintain elasticity.
Check the thresholds regularly, especially after the winter season. If you notice a chip, clean it and smear it with a small amount of material or sealant to prevent moisture from entering the metal. Timely minor repairs extend the life of all protection.
Can I apply anti-gravel to rust?
You can not apply antigravel directly to rust. Rust must be cleaned to metal, treated with a converter and primed. Otherwise, the corrosion process will continue under the coating and destroy the metal from the inside.
How to wash off antigravel from skin and clothing?
Fresh material is easily washed away with gasoline, white spirit or a special solvent for antigravity. The frozen composition from clothing is practically not removed, and it is better to gently cut or wipe it with pumice after softening with oil.
Do I need to lay the thresholds before antigravity?
Yes, applying soil (especially epoxy) to the purified metal significantly increases adhesion and creates an additional barrier to corrosion. This is a necessary step for long-term protection.
What temperature is required for application?
The optimum air and body surface temperature should be above +15°C. At lower temperatures, the material becomes viscous, poorly sprayed, and may not polymerize correctly.