Anti-corrosion agent Body 930 from a German brand Liqui Moly has long been the standard for protecting car bodies from rust. This bitumen-rubber composition is valued for its high adhesion, elasticity and ability to withstand mechanical loads. But before application, many car owners are faced with the question: how to properly dilute Body 930so as not to lose its protective properties and achieve optimal consistency for work?
In this article we will look at the manufacturer's official recommendations, alternative solvents (including white spirit, gasoline "Galosha" and specialized compounds), as well as typical errors that lead to delamination of the coating or a decrease in the service life of the anti-corrosion agent. We will pay special attention dilution proportions for different application methods - brush, spray or dip parts. If you plan to treat hidden cavities or exterior body panels, this information will help you avoid costly rework.
Official recommendations of Liqui Moly: what the manufacturer says
Company Liqui Moly in the technical documentation for Body 930 indicates that the composition is supplied ready-to-use and does not require mandatory dilution. However, to facilitate application (especially when using a spray gun or in cold conditions), solvents may be added. Important: the manufacturer recommends using only original Liqui Moly Schnell-Reiniger solvent (art. 1900) or its analogues based on aliphatic hydrocarbons.
Standard dilution proportions according to instructions:
- 🔧 For brush or roller: up to 5% solvent of the total volume (for example, 50 ml per 1 liter of anticorrosive).
- 🖌️ For spraying: 10–15% solvent (100–150 ml per 1 liter).
- ❄️ At temperatures below +10°C: up to 20% solvent to improve fluidity.
⚠️ Attention: Exceeding the solvent concentration by more than 20% leads to disruption of the structure of the bitumen-rubber matrix. The coating loses elasticity and becomes brittle at low temperatures.
In the technical data sheet Body 930 It is also indicated that after dilution, the composition must be thoroughly mixed for 5–7 minutes until a homogeneous consistency. Using a mixer at low speeds (up to 300 rpm) is preferable to manual mixing.
Alternative solvents: what can be used instead of the original
Original solvent Liqui Moly Schnell-Reiniger is not always available, so car owners often look for analogues. It is important to understand that not all solvents are compatible with bitumen-rubber base Body 930. Below are proven options that do not violate the anticorrosive structure:
| Solvent | Max. permissible concentration | Pros | Cons |
|---|---|---|---|
| White spirit (GOST 3134-78) | up to 15% | Low cost, availability | Slows drying, may leave an oily film |
| Gasoline "Galosha" (BR-1) | up to 10% | Fast evaporation, good fluidity | Pungent odor, fire hazard |
| Solvent 646 | up to 5% | Universal for many paintwork materials | Aggressive to rubber, risk of delamination |
| Solvent | up to 20% | Good solvent power | Toxic, requires respiratory protection |
Auto chemical experts note that white spirit - the safest option among budget solvents, but it is better to limit its concentration to 10%. Galosh gasoline is suitable for dilution before spraying, but it cannot be used in enclosed spaces due to the high volatility of the vapors. Solvent 646 absolutely not recommended for Body 930, since it destroys the rubber components of the composition.
Before complete dilution, perform a test: mix 10 ml of anticorrosive agent with 1 ml of the selected solvent and apply to a small area. If after 24 hours no cracks or stickiness appear, the solvent is suitable.
Dilution ratios for different application methods
The consistency of the anticorrosive coating directly affects the quality of the coating. If the composition is too thick, it is difficult to distribute evenly with a brush, and if it is too liquid, it will flow off vertical surfaces. Below are the optimal proportions for various processing methods:
- 🖌️ Brush/roller:
- Temperature above +15°C: 3–5% solvent (30–50 ml per 1 l).
- Temperature +5…+15°C: 5–10% (50–100 ml per 1 l).
- 🔫 Spray (HVLP gun):
- Pressure 2–3 atm: 15–20% (150–200 ml per 1 l).
- Pressure 3–4 atm: 10–15% (100–150 ml per 1 l).
- 🚗 Treatment of hidden cavities (Movil):
- For a hose with a nozzle: up to 30% (300 ml per 1 l) to improve penetration.
For spraying, it is critical to maintain the viscosity of the composition. Optimal value - 18–22 sec using a VZ-246 viscometer (or 40–50 units according to DIN 4). If the viscosity is lower, the anticorrosive agent will form smudges; if higher, clog the gun nozzle. Adjust the consistency gradually by adding solvent in small portions.
Check the anticorrosive temperature (optimally +18...+25°C)|Use clean containers without residues of other paints|Add solvent in portions of 20–30 ml|Mix with a mixer at low speed|Filter the composition through a 100–150 micron mesh before spraying-->
Typical dilution mistakes and their consequences
Even experienced craftsmen sometimes make mistakes that nullify all efforts at anti-corrosion treatment. Here are the most common mistakes and their consequences:
- Using acetone or solvent 647.
These compounds aggressively destroy rubber components Body 930, leading to delamination of the coating. After 1-2 seasons, cracks appear in the treated areas, through which moisture penetrates to the metal.
- Exceeding the solvent concentration by more than 20%.
The coating loses elasticity and becomes brittle at sub-zero temperatures. When struck by gravel or stones, the anticorrosive will break off, exposing the metal.
- Application of unfiltered composition.
Dust particles or lumps of dried anticorrosive clog the spray nozzle, and “craters” are formed on the surface, which become centers of corrosion.
- Dilution with water or alcohol.
Water causes clouding of the composition and the formation of pores, and alcohol accelerates the drying of the top layer, preventing the anticorrosive polymer from polymerizing evenly.
⚠️ Attention: If after dilution the anticorrosive agent becomes cloudy or flakes appear in it, the composition is unsuitable for use. This occurs when mixed with incompatible solvents (for example, those containing ketones or esters).
Another common mistake is dilution. Body 930 "by eye". For example, some car owners pour in solvent until the composition becomes “like water,” citing ease of application. As a result, the coating dries in 1–2 hours, but after a month it begins to peel off. The correct approach is to add solvent in portions, checking the viscosity after each step.
How to dilute Body 930 for cavities
Processing the internal surfaces of doors, thresholds and side members requires a special approach. Here, not only the composition of the anticorrosive agent is important, but also its ability to penetrate hard-to-reach places. For these purposes Body 930 often diluted more than for external work, but with reservations:
- 🔧 For Movil: dilution to 30–40% (for example, 300–400 ml of solvent per 1 liter of anticorrosive). This allows the composition to be evenly distributed over the surface when supplied through the hose.
- 💨 For an aerosol can: if you flooded Body 930 into a can of propellant, enough 15–20% solvent to avoid clogging the valve.
- ⚙️ For processing welds: High adhesion is important here, so dilution should not exceed 10%.
When treating hidden cavities, it should be taken into account that excess solvent increases the drying time. In a confined space (such as inside a door), vapors can condense, forming a sticky layer. To avoid this, after application it is recommended:
- Leave the car in a ventilated area for 24 hours.
- After a day, repeat the treatment with a “dry” anticorrosive agent (without solvent) to compact the layer.
What happens if Body 930 for hidden cavities is not diluted?
Thick anticorrosive will not be able to evenly cover the internal surfaces, leaving untreated areas. Additionally, in cold temperatures it will thicken, blocking drainage holes. This will lead to moisture accumulation inside the cavities and accelerated corrosion.
Compatibility of Body 930 with other anticorrosion agents: can it be mixed?
Sometimes car owners have leftovers of different anti-corrosion compounds, and there is a temptation to mix them to save money. However Body 930 has a unique bitumen-rubber base, which is not always compatible with other products. Below is a table of compatibility with popular anticorrosion agents:
| Anticorrosive | Compatible with Body 930 | Notes |
|---|---|---|
| Dinitrol 479 | ❌ No | Contains wax additives that separate when mixed. |
| Tectyl ML | ⚠️ Partially | Can be mixed in a 1:1 ratio, but the service life of the coating is reduced. |
| Noxudol 700 | ✅ Yes | Similar base, but requires the addition of 5% white spirit for homogenization. |
| Movil (domestic) | ❌ No | Contains mineral oils which attack the rubber in Body 930. |
If you decide to mix Body 930 with another anticorrosive agent, be sure to carry out a compatibility test: mix small amounts (20–30 ml each) and apply to a test plate. After 24 hours, check:
- No delamination or sedimentation.
- Dries evenly without stickiness.
- Maintaining elasticity (the coating should not crack when the plate is bent).
⚠️ Attention: Mixing Body 930 with anticorrosive based epoxy resins (for example, Loctite 7649) leads to a chemical reaction, as a result of which the coating becomes brittle and peels off after 3–6 months.
Storage of diluted Body 930: terms and conditions
After dilution, the anticorrosive agent loses some of its preservative properties, so it must be used for a limited time. The manufacturer recommends the following storage conditions:
- 🕒 Shelf life of the diluted composition: no more 3 months in a hermetically sealed container.
- 🌡️ Temperature: from +5°C to +25°C. When freezing, the anticorrosive agent loses its elasticity.
- ☀️ Light protection: store in an opaque container or in a dark place, as UV rays accelerate polymerization.
- 🔥 Fire safety: the diluted composition is classified as flammable liquid (hazard class 3).
If diluted anticorrosive remains after treatment, it can be preserved longer by adding stabilizer - for example, Liqui Moly Lack-Stabilisator (art. 7656). The stabilizer slows down the oxidation process and prevents delamination. Dosage: 10 ml per 1 liter of diluted anticorrosive. It also helps to extend shelf life:
- Replacing the air in the container with an inert gas (for example, argon).
- Adding stainless steel balls (they reduce the area of contact with air).
Diluted Body 930 cannot be stored in plastic water or food bottles - residual moisture or sugar causes the composition to coagulate.
FAQ: Frequently asked questions about diluting Body 930
Can Body 930 be diluted with kerosene?
No, kerosene is not recommended for dilution Body 930. It contains sulfur compounds that oxidize the anticorrosive rubber components, leading to loss of elasticity. In addition, kerosene has a high residual odor and takes a long time to evaporate, which can cause irritation during further use of the car.
How to dilute Body 930 for application in winter at sub-zero temperatures?
At temperatures below 0°C Body 930 thickens and must be diluted to 25–30% solvent. Best to use arctic white spirit (with a freezing point below -30°C) or specialized solvents for winter work, for example, Liqui Moly Winter-Additiv (art. 3920). Important: after application, the car must be kept in a heated room for at least 12 hours for complete polymerization.
Can Body 930 be applied without dilution?
Yes, Body 930 can be applied without thinning, especially if you work with a brush or roller in warm conditions (+18°C and above). However, for spraying or treating hidden cavities, dilution is necessary - otherwise the composition will not penetrate well into microcracks and drainage holes. Also, undiluted anticorrosive agent is more difficult to distribute evenly over a large area.
What should I do if Body 930 thickens over time?
If the anticorrosive agent has thickened due to long-term storage, it can be restored by adding 5–10% original solvent and mix thoroughly with a mixer. If the composition has delaminated (an oily film has appeared on the surface), it is better to dispose of it - restoration does not guarantee uniformity of the coating. To prevent thickening, store the anticorrosive agent in an airtight container with minimal air access.
What solvent is best for thinning Body 930 before painting?
If you plan to apply Body 930 under a layer of paint, use solvent for bitumen mastics (for example, App Anti-Korrosions-Verdünner). It will ensure good adhesion between the anticorrosive coating and the paintwork. Important: After applying the anti-corrosion agent, allow it to dry completely (24-48 hours) before painting.