Flush for the underbody of a car: protection against corrosion for many years

What is a push salo and why is it used to protect the bottom?

Pushsalo is a thick lubricant based on petroleum oils with the addition of thickeners, anti-corrosion additives and oxidation inhibitors. Initially, it was developed for preserving equipment for long-term storage, but car owners quickly appreciated its effectiveness in combating rust on the bottom, arches and hidden cavities of the body. Unlike liquid anticorrosion agents, pushsalo does not drain from vertical surfaces and forms an elastic film that protects the metal from moisture, salts and mechanical damage.

The main advantage of pushsala is its versatility. It is suitable for treating both new and already corroded areas. For example, on cars older than 5 years, where the factory galvanization begins to deteriorate, push salo becomes a salvation: it penetrates microcracks and displaces moisture. At the same time, the cost of treatment is several times lower than that of professional anti-corrosion compounds such as Dinitrol or Tectyl.

But not everything is so simple: the wrong choice or application of a pushsal can lead to the opposite effect - corrosion will develop even more actively under a layer of lubricant. Therefore, before purchasing, it is important to understand the types of pushsal, its composition and technology of use.

Types of pushsala: what composition to choose for the bottom?

All pushsalas are divided into three main groups according to composition: oil, synthetic and combined. Each type has its pros and cons, as well as recommended areas of application. Let's take a closer look at them.

• 🛢️ Petroleum (mineral) - a classic version based on refined petroleum products. Cheap, but require frequent updating (every 1–2 years). Suitable for temporary protection or treatment of hidden cavities. Example: Pushsalo TU 38.101320-77.
• 🧪 Synthetic — made on the basis of synthetic oils with the addition of polymers. They last longer (3–5 years) and do not leak at high temperatures. Ideal for underbody and wheel arches. Popular brands: LIQUI MOLY Wachs-Konservator, Mannol Rust Stop.
• 🔄 Combined - a mixture of mineral and synthetic components. Average price segment, service life 2–3 years. Good balance between price and quality, e.g. AutoLubricant Pushsalo Universal.

For the underbody of a car, the optimal choice would be synthetic pushsalas. They not only retain their protective properties longer, but also withstand temperature changes better, do not crack in the cold and do not drain in the heat. Oil-based ones are suitable for treating the internal cavities of doors or thresholds, where there is no direct contact with road dirt.

Separately worth mentioning pushsalo with zinc (for example, Tsinkor-Auto). It contains microparticles of zinc, which create an additional galvanic barrier against corrosion. This composition is ideal for cars with damaged galvanization or after sandblasting rusty areas.

Advantages and disadvantages of pushsal compared to other anticorrosives

To understand whether it is worth choosing push salo instead of popular anti-corrosion mastics or wax compounds, let’s compare its key characteristics:

Parameter	Pussalo	Bitumen mastic	Wax anticorrosive	ML compositions
Protection period	2–5 years	3–7 years	1–2 years	5–10 years
Resistance to mechanical damage	Average	High	Low	High
Penetration ability	High	Low	Average	High
Price for 1 l	200–600 ₽	400–1200 ₽	500–1500 ₽	800–2500 ₽
Difficulty of application	Low	High	Average	High

The table shows that pushsalo loses ML-compositions (for example, Noxudol or Dinitrol ML) in terms of durability, but wins in price and ease of application. Bituminous mastics are more resistant to gravel impacts, but they are heavier and can peel off due to vibrations. Wax anti-corrosives quickly wash off and require annual renewal.

⚠️ Attention: The pushsalo is incompatible with rubber seals and plastic parts! If it comes into contact with them, it may cause swelling or cracking. Before processing, cover such elements with masking tape.

Critical nuance: the push salo does not protect against electrochemical corrosion caused by stray currents (for example, in garages with poor wiring). In such cases, it must be combined with zinc-containing primers or special inhibitors.

Step-by-step instructions: how to apply fluff on the underbody of a car

Processing the bottom with pushsal requires careful preparation. If you skip at least one stage, the effectiveness of protection will decrease significantly. Here is the full algorithm of actions:

1. Washing and drying. Wash the underbody of the car thoroughly using a high-pressure cleaner (minimum 100 bar). Use special shampoos to remove tar stains, e.g. Karcher RM 539. Dry the car for at least 12 hours in a warm room or using a heat gun.
2. Removing rust. Clean all areas of corrosion with a wire brush or sandblaster. For small stains, a rust converter is suitable (Tsinkar).
3. Degreasing. Wipe the surface with solvent (White spirit or Antisilicone). This will remove any remaining oils and provide better adhesion between the pushsal and the metal.
4. Application of primer (optional). Apply acid primer to heavily damaged areas (Reoflex Acid Primer) for added protection.
5. Pussal processing. Apply the composition with a brush, spray or spatula in a layer of 1–2 mm. Pay special attention to welds and panel joints.

High pressure underbody washing

Removing rust by brushing/sandblasting

Degreasing with white spirit

Checking hidden cavities for moisture

Protecting rubber seals with tape-->

For application use:

• 🖌️ Brush — for spot treatment of hard-to-reach places (for example, internal cavities of thresholds).
• 🎨 Sprayer — convenient for large areas, but requires diluting the pushsala with a solvent (1:1 ratio).
• 👷 Spatula — suitable for thick compositions, allows you to control the thickness of the layer.

The temperature during application should not be lower than +10°C. If you are treating the car in winter, heat the push salo in a water bath to +30...+40°C - this will improve its fluidity.

Top 5 mistakes when processing the bottom with a pushsal

Even experienced car owners make mistakes that ruin all anti-corrosion treatment efforts. Here are the most common of them:

1. Application on a damp surface. If the metal is not dry after washing, water will remain under the pushsal layer, which will accelerate corrosion. Use a moisture meter or dry your car for at least 24 hours.
2. Too thin or thick layer. The optimal thickness is 1–2 mm. A thin layer will quickly wear off, but a thick layer (more than 3 mm) may crack.
3. Ignoring hidden cavities. Many people process only the visible parts of the bottom, forgetting about the side members, reinforcements and inner surfaces of the doors. This is where corrosion develops most actively.
4. Using low-quality pushsal. Cheap compounds without corrosion inhibitors may contain aggressive acids that corrode the metal over time.
5. No re-processing. Even the most durable push sala requires updating every 2-3 years. If you miss this moment, you risk discovering rust through.

⚠️ Attention: Never apply pushsalo over old peeling mastic! This will lead to the formation of a “layer cake”, under which moisture will accumulate. The old coating must be completely removed mechanically or with chemical removers (Body 700).

Another typical problem is uneven distribution. If you apply pushsalo with a brush with chaotic movements, gaps will remain. Use the "criss-cross" method: first coat the surface in one direction, then perpendicularly.

How often to update the push salo and signs that it’s time to do it

The service life of the pushsala depends on the operating conditions of the vehicle:

• 🚗 City driving on asphalt: 3–4 years.
• 🏔️ Travel on dirt roads: 2–3 years.
• 🧂 Operation in regions with abundant use of reagents: 1–2 years.

But how do you understand that the protection is no longer working? Look out for the following signs:

• 🔍 Pussalas appeared on the surface cracks or it started flake off.
• 💧 After the rain they remain under the car rusty stains.
• 🔊 When driving on gravel you can hear the sound of stones on metal (this means the protective layer has worn out).
• 🧲 Magnetic check: if the magnet sticks to the bottom more than before, the metal is exposed.

To extend the service life of the pushsala, it is recommended:

1. Wash the bottom twice a year without aggressive detergents (they destroy the protective layer).
2. After washing, treat the surface restorative spray (for example, Wurth HHS 2000).
3. Avoid parking on wet grass or snow — prolonged contact with moisture reduces the service life of the anticorrosive coating.

Alternatives to pushsal: when should you choose a different anticorrosive agent?

Pussalo is not a panacea. In some cases, it is more advisable to use other compositions:

Situation	Recommended anticorrosive	Reason
New car (up to 3 years)	ML compositions (Noxudol, Dinitrol ML)	Long-term protection (up to 10 years) without the need to update.
Severe corrosion with through holes	Epoxy putty + bitumen mastic	Pussalo will not restore the integrity of the metal; a patch is needed.
Operation in high humidity conditions (coastal regions)	Zinc-containing soils + wax anticorrosives	Pussalo does not withstand salty air well.
Cars with plastic underbody protection	Anti-gravel coatings (3M, Krown)	The pushsalo may damage the plastic when removing the protection.

If you still want to use a push salo, but doubt its effectiveness, you can use combined scheme:

1. Apply epoxy primer to problem areas.
2. Cover the entire bottom pushsalom.
3. Add a layer on top bitumen mastic for mechanical protection.

What happens if you don’t update the push salo?

After 3–5 years without renewal, the push salo loses its elasticity and cracks. Moisture penetrates into the cracks, starting the process of “under-film” corrosion. This happens especially quickly at welds and panel joints, where the metal is thinner. As a result, rust eats away at the body from the inside, and during the next inspection you may find holes the size of a coin.

FAQ: Frequently asked questions about the bottom pushsal

Is it possible to apply pushsalo over rust?

Possible, but only if there is rust superficial (not through and not swollen). Before applying, be sure to clean the metal with a brush and treat it with a rust converter (Tsinkar or Runway). If the corrosion is deep, the push-salon will only temporarily slow down the process - welding or putty will be required.

How to remove old fluff before new treatment?

Removal methods depend on the state of the old layer:

• If there was a push soft - wash it off with kerosene or White spirit using a stiff brush.
• If dried up - use special washes (Body 700) or mechanical cleaning with a grinder.
• For hard to reach places A steam generator is suitable - hot steam softens the old anticorrosive agent.

After removal, be sure to degrease the surface!

Is it possible to paint over pushsala?

No, the paint will not stick to the fur coat - it remains sticky and does not polymerize. If you need to paint the treated areas:

1. Remove the fluff with solvent.
2. Apply acid soil (for example, Reoflex).
3. Cover acrylic primer and only then paint.

What is the difference between pushsalo and solid oil or litol?

Main differences:

Parameter	Pussalo	Solid oil	Litol
Corrosion protection period	2–5 years	3–6 months	1–2 years
Wash-off resistance	High	Low	Average
Temperature range	–50…+120°C	–30…+60°C	–40…+120°C

Solid oil and lithol are lubricants, not anticorrosive. They temporarily protect against moisture, but do not contain corrosion inhibitors and are quickly washed out.

Is it possible to use a push salo to machine wheel arches?

Yes, but with reservations:

• 🔹 It’s better to choose for arches synthetic fluff — it will not splash when moving.
• 🔹 Apply a thin layer (0.5–1 mm), otherwise the centrifugal force from the wheels will shed excess.
• 🔹 After treatment, avoid high pressure washing of arches for a week.

Alternative - anti-gravel coatings rubber based (eg 3M Undercoating), which better withstand stone impacts.