Rust on the body of the car is not just a cosmetic defect, but a serious threat to the integrity of the metal. Owners often face a choice: use a single-component spray or purchase a two-component spray. acidic. The quality of the primary treatment depends on how long the paint coating lasts and whether corrosion will appear again in a couple of months.
The autochemistry market is full of offers, but not all aerosols are equally effective. Some compounds only mask the problem, while others create a reliable chemical barrier. In this article we will discuss which phosphate It really works how to distinguish a quality product from a cheap counterpart and why proper surface preparation is more important than the brand itself.
Why you need an acid primer for body repair
The main task of the primary coating is to ensure maximum adhesion and stop oxidative processes. Acid soil, often called "wash primer", contains orthophosphoric acid, which reacts with iron oxides. This allows you to convert loose rust into a strong compound, preventing its further spread.
Unlike epoxy compounds, which create an insulating film, acid primers work at a chemical level. They penetrate into the microcracks and pores of the metal, "preserving" it from the inside. Use of the spray-bag in this case, it is justified for local repairs, hard-to-reach places or rapid treatment of small foci of corrosion.
⚠️ Attention: Acid soil can not be used for polyester putty. The acid will react with the resin, which will lead to detachment and the appearance of bubbles. Always apply the putty to the ground or use an epoxy insulator.
It is important to understand that this type of coverage is not the finish line. It requires mandatory overlapping with secondary soil-filler. Without this layer, atmospheric impacts will quickly destroy the thin protective film and corrosion will return.
Types of acid soils in aerosols
When choosing a can, you will come across two main types of compositions. Understanding their differences is critical to achieving a qualitative result. The first type is one-component compositions, ready for use immediately after shaking.
The second type is two-component systems, where the activator is located in the cylinder cap. Before use, it is necessary to squeeze the gas from the cap inside the cylinder, mix the components and shake thoroughly. Exactly. acidic It is considered a more reliable and durable option for professional repairs.
Single-component variants often sin low concentration of active substances and rapid drying, which reduces the reaction time with the metal. Two-part analogues, such as Body 960 or MotipThey provide deeper etching and better protection.
Criteria for the selection of quality composition
How do you know which bottle is in front of you without opening it? First of all, pay attention to the description of the composition. A quality product always contains information about the percentage of zinc or chromates (although the latter are rare due to the environment).
The volume of the balloon also matters. For processing thresholds or arches standard 200-300 ml may not be enough, will require 500 ml or several pieces. Cheap analogues often contain a lot of solvent, which quickly evaporates, leaving a thin layer of protection.
Be sure to check the production date. The shelf life of acid soils is limited, especially two-component. An expired product may simply not catch on or lose its anti-corrosion properties.
Why can't we save on the ground?
Cheap soils often do not contain enough phosphoric acid. Instead of reacting with metal, a simple surface coloring occurs. After six months, rust begins to swell under the paint, and the work has to be remade completely, spending money on new materials and work.
Rating of popular brands and models
Based on the feedback of professionals and tests, market leaders can be identified. Below is a comparative description of popular products available on sale.
| Brand/Model/Model/ | Type | Features | Recommended application |
|---|---|---|---|
| HB Body 960 | 2K (two-component) | High adhesion, yellow. | Professional repairs, difficult conditions |
| Motip Deco | 1K (single component) | Accessibility, convenience | Minor cosmetic repairs |
| Runway RN603 | 1K | Budget segment | Temporary protection, hidden cavities |
| Novol Protect 360 | 2K | High zinc content | Severely damaged areas |
The leader among professionals remains HB Body 960 Wash Primer. Despite the higher price, it offers the best protection thanks to the two-component formula. Budget options like Runway They are suitable for primary treatment of hidden cavities where the visual component is not important.
Proper application technology
The effectiveness of acid soil is 90% dependent on surface preparation. The metal should be cleaned to shine, defatted and dried. Any residue of oil or silicone will result in the coating detached.
The application process is as follows:
- 🛡️ Clean the damaged area with abrasive P80-P120 to pure metal.
- 🧼 Carefully degrease the surface with antisilicone.
- 🌬️ Shake the balloon for at least 2-3 minutes (for 2K - after activation).
- 🎨 Apply in thin layers from a distance of 20-25 cm.
- ⏳ Hold the technological pause of 10-15 minutes between the layers.
Do not try to fill the damage with one thick layer. The acid soil should dry quickly, forming a thin matte film. If applied too fat, it may not dry completely, which will violate the adhesion of the next layer.
☑️ Preparedness for soil application
Security measures and working conditions
Work with acid compositions requires strict compliance with safety precautions. Solvent vapors and acid vaporization are toxic. Work should only be done in a well-ventilated room or on the street.
The use of a respirator is mandatory. Even short-term inhalation of the aerosol can cause irritation of the airways or dizziness. Eyes and skin of the hands should also be protected, as exposure to acid in exposed areas can cause chemical burns.
⚠️ Attention: Do not work at temperatures below +10 ° C and high humidity. Condensate on the metal neutralizes the action of the acid, and the soil will not perform its function.
After work, the canister should be disposed of in accordance with the rules for aerosols. You can not pierce or burn even empty containers, as the pressure remains inside.
Frequent errors when using sprays
One of the most common mistakes is applying the soil to smooth, uncleaned rust. The acid is not able to "eat" a thick layer of oxides, it needs contact with the metal. The surface must be matte.
Another mistake is ignoring the instructions for activating two-component cylinders. If you do not fully squeeze the activator or shake the mixture poorly, the reaction will not go, and you will get a regular varnish with dye, which will be washed off with the first sink.
Warm up the balloon with soil in warm water (about 30-40°C) before use. This will improve spraying and make the torch more uniform, especially if the balloon is cold.
Also, do not leave an open balloon in the sun. The pressure inside can increase, leading to valve deformation or even tank explosion.
Comparison with alternative protection methods
Should I use acid soil at all, or is it better to choose epoxy? Epoxy formulations create a thicker and mechanically strong film, completely insulating the metal from moisture. However, they require perfect preparation and do not work on the residues of rust.
Acid soil It benefits in situations where it is impossible to clean up hard-to-reach areas perfectly or where there is a risk of micro-oxides. He is an active defender, not just a barrier. For complex protection, a bundle is often used: acid + epoxy.
The choice depends on the specific task. For the bottom and hidden cavities, wax compositions or epoxide are better suited, and for preparation for painting visible body elements, it is acid primers.
Acid soil is the first line of defense. It does not hide defects, but it ensures that rust will not come out of the paint in the future.
Can I paint directly on acid soil?
No, you can't. The acid soil is hygroscopic (absorbs moisture) and does not have sufficient cover. It must be covered with acrylic soil-filler, which will create a flat surface and isolates the acid layer from atmospheric influences.
How much does the acid soil in the balloon dry?
The drying time "on the stick" is 10-20 minutes at a temperature of +20 ° C. Full polymerization and readiness to grind or apply the next layer take about 30-60 minutes. In cold weather, time increases.
Do I need to polish the acid soil?
By itself, acid soil does not need to be polished, since its layer is very thin (5-10 microns). You risk rubbing it to metal, depriving it of protection. The secondary acrylic soil applied on top of the acid soil is already grinded.
What is the flow rate of one 500 ml cylinder?
One high-quality cylinder with a volume of 500 ml is usually enough to process 1.5-2 square meters of surface in one layer. For the full processing of one arch or threshold, 1-2 cylinders may be required, taking into account the application in 2 layers.