Car sills are one of the most vulnerable parts of the body. They are constantly exposed to gravel, salt, moisture and mechanical damage. Even a small scratch on the threshold can become a source of corrosion, which over time will “eat” the metal right through. Properly selected paint will not only restore the car’s aesthetic appearance, but will also protect the body from rust for years to come.
In this article we will look at 7 proven ways to paint thresholds - from budget spray cans to professional powder processing. You will find out which option is suitable for garage repair, and which requires specialized equipment. We will also compare the cost of materials, the durability of the coating and the complexity of application, so that you can choose the optimal solution for your car - be it VAZ 2110 or Toyota Camry last generation.
1. Why do sills rust faster than other parts of the body?
Thresholds take over up to 40% of all mechanical damage to the body (company research data 3M in autochemistry). Here are the main reasons for their accelerated wear:
- 💦 Constant contact with moisture: rain, snow, puddles with reagents in winter - all this accumulates on the thresholds and penetrates under the paintwork.
- 🪨 Impacts of gravel and sand: when moving, the wheels raise abrasive particles that hit the lower edge of the sills like a sandblast.
- 🧂 Chemical corrosion: salt and reagents on the roads in winter corrode even the factory coating in 2-3 seasons.
- 🚗 Mechanical loads: shoes of passengers, impacts from doors of neighboring cars in the parking lot, scratches from curbs.
Most car owners notice the problem too late, when rust has already eaten through the metal. To avoid costly repairs, it is enough Renew the protective coating every 2-3 years. But what material should you choose?
2. 7 ways to paint thresholds: comparison of methods
The choice of material depends on the budget, the condition of the thresholds and your skills. Below is a comparison table of the key characteristics of each option.
| Method | Cost (for 1 threshold) | Difficulty of application | Durability | Corrosion protection | Suitable for |
|---|---|---|---|---|---|
| Spray can with auto enamel | 200–600 ₽ | ⭐⭐ (easy) | 1–2 years | Average | Local repairs, minor scratches |
| Anti-gravel coating | 800–1 500 ₽ | ⭐⭐⭐ (average) | 3–5 years | High | Prevention, new thresholds |
| Liquid rubber | 1 200–2 500 ₽ | ⭐⭐⭐ (average) | 4–6 years | Very high | Aggressive operation, SUVs |
| Powder painting | 2 000–4 000 ₽ | ⭐⭐⭐⭐ (difficult) | 7–10 years | Maximum | Major repairs, premium cars |
| Vinyl film | 1 500–3 000 ₽ | ⭐⭐⭐ (average) | 3–4 years | Average | Temporary protection, tuning |
Next, we will analyze in detail each method, its pros/cons and nuances of application.
3. A can of auto enamel: fast and cheap
The most accessible way to update thresholds is to use aerosol auto enamel in cans. This method is suitable for local repairs small areas (scratches, chips) or complete repainting if the thresholds have not yet rusted through.
Benefits:
- 💰 Low price: a can of high-quality enamel (for example, Motip or Kudo) costs 300–600 ₽.
- 🔧 Easy to apply: does not require special equipment, can be painted in the garage.
- 🎨 Wide choice of colors: choose the shade for any car (use the body color code).
Disadvantages:
- ⏳ Short service life: without additional protection (varnish or anti-gravel), the paint will last 1-2 seasons.
- 🛠️ Requires careful preparation: If you don’t clean off the rust well, it will appear in 2-3 months.
- 🌡️ Temperature sensitivity: When painting below +10°C, the enamel will lie unevenly.
Remove rust with sandpaper or a grinder with a brush |
Treat with a rust converter (for example, Tsinkar)|
Degrease the surface with white spirit or anti-silicone |
Prime (if metal is exposed)|
Apply 2–3 layers of paint at intervals of 10–15 minutes
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For best results, combine enamel with clear varnish (for example, APP Nanoprotech). This will increase the service life of the coating to 2-3 years. If the thresholds already have deep pockets of corrosion, a spray can will not help - welding or putty will be required.
To ensure that the spray paint goes on smoothly, heat it in warm water (not higher than 50°C) for 5–10 minutes before use. This will increase the pressure and improve atomization.
4. Anti-gravel coating: reliable protection against chipping
Anti-gravel is elastic polymer coating, which is applied over the paint and protects the thresholds from the impacts of gravel, sand and moisture. Unlike ordinary enamel, it does not crack when deformed and can withstand temperatures from -60°C to +120°C.
Types of anti-gravel:
- 🔴 Water based (for example, Noxudol): environmentally friendly, but less wear-resistant.
- 🟢 Solvent based (for example, Dinitrol 479): stronger, but requires a respirator when applied.
- ⚪ Acrylic (for example, Body 930): universal, suitable for independent use.
How to apply anti-gravel:
- Clean the threshold from dirt and rust, degrease.
- Apply 2-3 layers of primer (if the metal is bare).
- Paint the threshold with auto enamel (if you need to restore the color).
- Spray anti-gravel from a distance of 20–30 cm using even movements.
- Allow to dry for 24 hours (full cure takes up to 7 days).
What is the difference between anti-gravel and liquid rubber?
Anti-gravel is hard covering based on polymers, which after drying forms a durable film. Liquid rubber (Plasti Dip) remains elastic and can self-regenerate with minor damage. Anti-gravel better protects against chipping, and liquid rubber protects against corrosion and vibration.
The cost of treating one threshold with anti-gravel is from 800 to 1,500 rubles (depending on the brand). For comparison: in a car service, such a service will cost 2,000–3,500 rubles per threshold. The main disadvantage of the method is difficult to remove for repeated repairs (you will have to grind).
5. Liquid rubber: revolutionary protection
Liquid rubber (for example, Plasti Dip or Rubber Paint) is an innovative coating that combines the properties of paint and protective film. It is applied as a spray, and after drying it forms an elastic layer 0.5–1 mm thick, which:
- 🛡️ Protects against corrosion and chips.
- 🔄 Self-healing for minor scratches.
- 🎨 Can be colored or transparent (to preserve the factory shade).
- ☠️ Easily removed without leaving marks (unlike anti-gravel).
Step-by-step application instructions:
- Wash and degrease the threshold thoroughly (use
isopropyl alcohol 99%). - Apply 4–6 layers of liquid rubber at intervals of 15–20 minutes (the thicker the layer, the more reliable the protection).
- Dry for 24 hours at +20°C (full polymerization - 7 days).
Cost of the set Plasti Dip (1 l) - about 2,500 ₽, this is enough for 2-3 thresholds. The main advantage of the method is reversibility: If the coating becomes damaged, it can be touched up locally or completely removed without damaging the factory paint.
Liquid rubber is the only material from this review that can be applied straight to the rust (if it is not end-to-end). It seals the source of corrosion and stops its spread.
6. Powder painting: a professional approach
Powder painting is the most durable method, which is used in factories to process rims, bumpers and other loaded parts. Powder paint is applied electrostatically and then “baked” in an oven at 180–200°C to form a durable coating 60–100 microns thick.
Benefits:
- 🔥 Extreme wear resistance: Withstands shock, chemicals and temperature changes.
- 🛡️ 100% corrosion protection: The powder penetrates even into microcracks.
- 🎨 Perfect adhesion: Does not peel off or crack over time.
Disadvantages:
- 💸 High price: from 2,000 ₽ per threshold (plus work 1,500–3,000 ₽).
- 🔧 Process complexity: requires an oven for polymerization (cannot be done in a garage).
- 🔥 Risk of deformation: Not suitable for plastic sill trims.
This method is justified for:
- 🚗 Premium cars (for example, Mercedes, BMW) where durability is important.
- 🏜️ SUVs and crossovers with aggressive operation.
- 🔧 Car after welding repair of thresholds (powder seals seams).
If you don't want to overpay for powder coating, look for services that offer "group" processing. For example, some shops bake customers' parts together, reducing the cost by 20-30%.
7. Vinyl film and other alternative methods
If you need to quickly and inexpensively update your thresholds without painting, consider these options:
Vinyl film
Pros:
- 🎨 Large selection of colors and textures (including carbon and metallic).
- 🛡️ Protects against small chips and UV rays.
- 🔄 Easy to remove without leaving marks.
Cons:
- ❄️ Does not tolerate frost well (can peel off at -30°C).
- 💦 Does not protect against corrosion (if there is rust under the film, it will spread).
Door sills
Plastic or aluminum covers (e.g. for Toyota Hilux or Nissan Navara) cost from 1,500 ₽ per piece. They are attached to self-tapping screws or double-sided tape and completely cover the threshold from external influences. Minus - they can collect dirt in the joints.
Galvanizing of thresholds
Method hot galvanizing (immersion of a part in molten zinc) is used in factories to protect bodies from corrosion for 10–15 years. Can be used in garage conditions zinc spray (for example, Zinc Rich Primer), but its protective properties are lower.
8. Which method should I choose? Recommendations for car brands
Here are brief recommendations depending on the type of car and budget:
| Vehicle type | Budget | Recommended Method | Example materials |
|---|---|---|---|
| Budget cars (VAZ, Renault Logan) | Up to 1,000 ₽ | Spray can + anti-gravel | Kudo enamel + Body 930 |
| Middle class (Toyota Corolla, Hyundai Solaris) | 1 000–3 000 ₽ | Liquid rubber or anti-gravel | Plasti Dip or Dinitrol 479 |
| Premium and SUVs (Land Cruiser, BMW X5) | From 3,000 ₽ | Powder painting | Car service with oven |
| Car with rusty sills | From 2,000 ₽ | Liquid rubber + welding | Rubber Paint + repair work |
When in doubt, start with anti-gravel coating — it gives the best balance of price and protection. Suitable for a temporary solution (for example, before selling a car) vinyl film.
Don't skimp on preparation! Even the most expensive paint will not save the thresholds if the rust is not removed and the surface is not degreased. Preparation accounts for 70% of the success of a repair.
FAQ: Frequently asked questions about painting thresholds
Is it possible to paint thresholds in winter?
Yes, but with reservations:
- The temperature in the garage should not be lower than +10°C (otherwise the paint will lie unevenly).
- Use quick-drying enamels (for example, Motip Speed).
- After painting, warm up the threshold infrared lamp to accelerate polymerization.
If you paint outdoors at -5°C, the coating will crack within 1–2 months.
Which paint color should I choose: to match the body color or contrast?
It depends on the purpose:
- Body tone — if you want to keep the factory appearance (use the car color code).
- Contrasting (black, gray) - if the thresholds are already defective, and full painting is not planned. The black color visually hides chips.
- Metallic color - for tuning (for example, gold thresholds on Lexus).
Remember: contrasting thresholds can reduce the value of a car when selling (buyers perceive this as a sign of hidden corrosion).
What to do if the rust has already eaten right through the threshold?
In this case, painting will not help - you need welding repair:
- Cut out the rusted area with a grinder.
- Weld a patch of sheet metal 0.8–1 mm thick.
- Finish the seams zinc spray (for example, Zinc Spray).
- Apply 2-3 layers of primer and paint.
The cost of such repairs in the service is from 5,000 rubles per threshold. If the hole is not repaired, the rust will spread to the side members, and repairs will cost 50,000 rubles or more.
How often do you need to renew the protective coating of thresholds?
The period depends on the material and operating conditions:
| Coverage type | Service life | Signs of wear |
|---|---|---|
| Balloon enamel | 1–2 years | Cracks, chips, dull color |
| Anti-gravel | 3–5 years | Peeling, exposed metal |
| Liquid rubber | 4–6 years | Loss of elasticity, stickiness |
| Powder paint | 7–10 years | Local chips (usually at corners) |
In aggressive conditions (driving on gravel, winter reagents), renew the coating 30–50% more often.
Is it possible to paint the thresholds without removing the doors?
Yes, but it will complicate the process:
- 🔧 You'll have to seal with masking tape door joints and seals.
- 🎨 For even application, use flexible nozzle for the can.
- ⚠️ Risk of paint getting on glass and rubber seals (they will have to be wiped off later)
white spirit).
If you have never painted a car yourself, it is better to remove the doors or contact a service center.