Corrosion is the main enemy of a metal car body, and colorless anti-corrosion agent in aerosol packaging has become a popular solution for those who want to protect their car without changing its appearance. Unlike traditional mastics or color compounds, clear sprays form an invisible barrier that prevents oxidation while maintaining the original color and texture of the paintwork. However, not all colorless anticorrosion agents are equally effective: some create a temporary film, others penetrate microcracks, and others contain inhibitors that slow down rusting processes that have already begun.
The choice of a suitable product depends on the purpose: for hidden cavities, compositions with high fluidity are suitable, for open surfaces - UV-resistant formulas, and for welds - anticorrosives with rust converters. In this article we will analyze chemical composition transparent aerosols, compare top brands (Liqui Moly, Tectyl, Runway), we will give step-by-step instructions for application and cut 5 common mistakes, which reduce the effectiveness of protection to zero. You will also find out why colorless anticorrosive agent can become worse than colored in some cases - and how to avoid it.
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How does colorless anticorrosive agent differ from traditional products?
The main difference between transparent aerosols and classic mastics or bitumen compositions is lack of pigmentation. This means that after application there will be no black, gray or brown spots left on the body, which often spoil the appearance if used carelessly. However, colorlessness is achieved due to other components:
- 🧪 Synthetic resins — form an elastic film that is resistant to vibrations and temperature changes. For example, in Liqui Moly Unterboden-Schutz acrylic copolymers are used.
- 💧 Corrosion inhibitors - chemical additives that “freeze” rust that has already begun. B Tectyl ML these are amines and phosphates.
- 🌡️ Solvents — provide fluidity of the composition for penetration into microcracks. Cheap products can use aggressive substances that corrode paintwork.
- 🛡️ UV filters — protect the film from destruction under sunlight (important for open surfaces). Absent in most budget anticorrosives.
The key disadvantage of colorless sprays is they do not mask existing rust. If there are pockets of corrosion on the body, the transparent composition does not hide them, but only slows down the spread. In such cases, pre-treatment with a rust converter (for example, ASTROhim Antiruster).
⚠️ Attention: Colorless wax-based anticorrosives (for example, Sonax Nanopro>) provide only temporary protection (3-6 months) and require regular updating. For long-term preservation, use compositions with polymer resins.
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Top 5 colorless anticorrosives in aerosol: comparison of characteristics
We tested popular transparent anticorrosives for resistance to salt, moisture and mechanical stress. The table below contains objective data on key parameters:
| Brand and model | Type of protection | Durability (months) | Temperature range | Price for 400 ml (₽) | Features |
|---|---|---|---|---|---|
| Liqui Moly Unterboden-Schutz | Polymer film | 12–18 | from –40°C to +120°C | 850–950 | Contains zinc, suitable for hidden cavities |
| Tectyl ML Transparent | Wax + inhibitors | 6–12 | from –30°C to +80°C | 700–800 | Easy to apply, but is susceptible to high pressure washers |
| Runway RW6116 | Resin base | 8–14 | from –25°C to +100°C | 450–550 | Budget option, but requires 2-3 layers |
| Würth HHS 2000 Transparent | Hybrid formula | 18–24 | from –50°C to +150°C | 1200–1400 | Professional composition, resistant to reagents |
| ASTROhim AC-415 | Wax + silicone | 4–7 | from –20°C to +70°C | 300–400 | For temporary protection, not suitable for winter use |
The best choice for most car owners is Liqui Moly or Würth, if the budget allows. Suitable for hidden cavities (thresholds, side members) Tectyl ML, but it needs to be updated once a year. Budget Runway requires careful surface preparation: when applied to rust, the effect will be minimal.
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Step-by-step instructions: how to apply colorless anticorrosive agent correctly
Errors at the preparation or application stage reduce the effectiveness of the anticorrosive agent to zero. Follow these instructions to get maximum protection:
- Washing and drying. Wash the treated area thoroughly with car shampoo (for example, Karcher RM 801), then dry with a compressor or hairdryer. Humidity above 10% impairs the adhesion of the composition.
- Rust treatment. If there are areas of corrosion, apply a converter (e.g. Hi-Gear Rust Treatment) and remove loose particles with a brush.
- Degreasing. Wipe the surface
White spiritor a specialized degreaser (ABRO Masters). Do not use acetone - it destroys paintwork! - Protection of neighboring areas. Cover plastic parts, glass and rubber seals with masking tape. Transparent anticorrosive is difficult to remove from these surfaces.
- Application of the composition. Shake the can for 2-3 minutes, hold it at a distance of 20-30 cm. Apply in thin layers (2-3 passes) at intervals of 10-15 minutes.
- Drying. Avoid operating the vehicle for 12–24 hours (depending on composition). In wet weather, drying takes up to 48 hours.
☑️ Preparation for applying anticorrosive
A critical mistake is applying anticorrosive to a dirty or wet surface. In this case, the composition will not penetrate into the micropores of the metal, and the protection will be superficial. Also avoid a thick layer: it may drip and form an uneven film.
To process sills and side members, use a flexible extension nozzle (included with some cylinders). It allows you to get to hidden cavities without dismantling the casing.
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5 mistakes that destroy the protection of colorless anticorrosive paint
Even an expensive anticorrosive agent will lose effectiveness if you make these mistakes:
- 🚫 Application at temperatures below +10°C. Most compositions polymerize only at positive temperatures. When cold, the film becomes brittle and cracks.
- 🚫 Use after high pressure washing. A jet of water under a pressure of 150–200 bar washes away up to 70% of the protective layer. After treatment, wash the car only by hand or using a non-contact method.
- 🚫 Neglecting surface preparation. Residues of wax, silicone or polish prevent the anti-corrosive coating from adhering to the metal. Always degrease the surface!
- 🚫 Application to freshly painted parts. The paint needs 2-3 weeks to fully polymerize. If the anticorrosive agent is applied earlier, it may cause clouding of the paintwork.
- 🚫 Storing the cylinder in hot weather. Temperatures above +40°C lead to increased pressure in the aerosol and poor atomization. Store the anticorrosive agent in a cool place.
⚠️ Attention: If, after applying the anticorrosive agent, white streaks appear on the surface, this means that the composition was applied in too thick a layer or did not dry. Remove excess with a cloth soaked in White spirit, and repeat the procedure.
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Colorless vs colored anticorrosive: when does a transparent composition lose?
Transparent anticorrosives are convenient, but there are situations when they are less effective than their colored counterparts:
- Heavily corroded surfaces. Colored mastics (for example, Dinitrol 4010) contain pigments that mask rust and create a thicker layer of protection.
- Operation in aggressive conditions. On trucks or SUVs that drive off-road, it is better to use bitumen mastics - they last longer under mechanical stress.
- Weld protection. Colorless compounds do not penetrate welding pores well. Here you need specialized products with zinc (for example, Würth Zinc Spray).
- Long-term preservation. To store a car for more than 2 years, colored mastics (for example, Tectyl 506) provide more reliable protection due to the greater thickness of the layer.
However, colorless anticorrosives have undeniable advantages:
- ✅ Preserve the appearance of the car (important for collectible or new cars).
- ✅ Suitable for processing chrome and polished parts.
- ✅ Easier to update - no need to completely remove the old layer.
Colorless anticorrosive agent is optimal for preventing corrosion on new or well-preserved cars. To combat existing rust, choose colored mastics with converters.
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How to extend the effect of colorless anticorrosive agent: expert advice
The service life of transparent protection can be increased by 1.5–2 times if you follow these recommendations:
- 🔄 Regular inspection. Check treated areas every 3 months for chips or blisters. If defects are found, apply a new layer spotwise.
- 🚿 Gentle wash. Use pH neutral shampoos (eg. Meguiar’s Gold Class) and avoid hard brushes. Abrasives destroy the protective film.
- 🌞 UV protection. If the anti-corrosion agent does not contain UV filters, park the car in the shade or use covers for open surfaces.
- 🧴 Additional processing. After anticorrosion, you can apply a ceramic coating (for example, Ceramic Pro 9H) - it will enhance protection against chemical reagents.
For hidden cavities (thresholds, doors), update the anticorrosive agent every 12–18 months, even if everything looks normal on the outside. Condensation accumulates in these areas, which over time destroys the protective layer.
What to do if the anticorrosive agent begins to peel off?
If the film comes off in layers, this means that the surface was poorly prepared. Remove the old layer with a solvent (eg App Wash & Wax Remover), degrease the metal and reapply anti-corrosive. If the detachment is point-like, local treatment is sufficient.
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FAQ: Frequently asked questions about colorless anticorrosive
Is it possible to apply colorless anticorrosive to plastic parts?
No, most clear anti-corrosives contain solvents that can damage plastic (especially unpainted plastic). For plastic bumpers or body kits, use specialized products, for example, Sonax Plastic Care.
How many layers of anticorrosive are needed for maximum protection?
Optimally 2-3 thin layers with an interval of 10-15 minutes. One thick layer penetrates micropores worse and takes longer to dry. The exception is hidden cavities: here you can apply 1 thick layer for better spreading.
Is it possible to paint over colorless anticorrosive?
Yes, but only after complete polymerization (usually 24–48 hours). Lightly sand the surface with sandpaper before painting. P800–P1000 to improve paint adhesion. Do not use nitrocellulose-based primers - they can dissolve the anticorrosive agent.
How to remove colorless anticorrosive if it gets on glass or rubber?
Fresh stains can be removed with a napkin. White spirit or App Cleaner. The dried composition must be soaked with paint solvent (for example, Runway RW6006), then carefully scrape off with a plastic spatula. Suitable for glass Ceriglass.
Is colorless anticorrosive harmful to health?
Aerosol anticorrosives contain volatile organic compounds (VOCs) that may cause dizziness or respiratory irritation. Work in a well-ventilated area or outdoors and use a respirator (eg 3M 6200) and gloves. After treatment, ventilate the salon for 1–2 hours.