After 3-5 years of use, black plastic on car bumpers, moldings or mirrors loses its color saturation, becomes covered with microcracks and acquires a dull gray tint. The reason is ultraviolet radiation, aggressive detergents and mechanical damage. If on Volkswagen Polo 2018 or Toyota RAV4 In 2020, plastic parts have lost their original appearance; they do not need to be changed: correctly selected paint will restore the appearance by 80-90%. The main thing is to choose a composition that is compatible with the type of plastic (ABS, PP, PVC) and take into account the features of surface preparation.
Car cosmetics manufacturers offer three main types of materials for painting black plastic: acrylic aerosols (for example, MOTIP Dupli-Color), liquid rubber coatings (Plasti Dip) and professional polyurethane enamels (PPG D8115). Each option has pros and cons: spray cans are easy to use, but require 3-4 layers for stability, liquid rubber is easy to remove, but is afraid of gasoline, and polyurethane compounds provide maximum wear resistance, but require a spray booth. An error in choosing a material or a violation of application technology will lead to peeling of the paint within a month.
Why does black plastic on cars fade and crack?
The main reason for the degradation of plastic parts is photooxidationcaused by UV rays. Contains most automotive plastics (especially ABS and polypropylene) contain carbon additives, which, under the influence of the sun, are destroyed, forming micropores. These pores become clogged with dirt, and the material itself becomes fragile. For example, on Renault Duster 2017, after 4 years of operation without protection, the plastic of the bumper loses up to 40% of its original strength.
Second factor - chemical exposure. Detergents with a pH above 10 (many shampoos for contactless washing) dissolve the top layer of plastic, and salts and reagents penetrate into microcracks in winter, accelerating destruction. On Kia Rio 2019, operated in Moscow, the plastic arch linings begin to “grey” after the second winter, if protective polish was not used.
- 🔥 UV radiation: breaks down the carbon chains in the plastic, leading to loss of color and the appearance of “web” cracks.
- 🧴 Aggressive chemistry: High pH shampoos, solvents and even some waxes accelerate degradation.
- ❄️ Temperature changes: in Russia, the difference between summer (+35°C) and winter (-30°C) leads to microdeformations of the material.
- 🚗 Mechanical damage: Sand, gravel and brushes on the sink leave scratches in which dirt accumulates.
⚠️ Attention: If the plastic is already covered with deep cracks (more than 0.5 mm), painting will not help - the part will need to be replaced or restored using polyurethane glue (for example, 3M Scotch-Weld DP630).
Types of plastic on a car and their features when painting
Automakers use three main types of plastic for exterior parts, and each requires a different approach to preparation and painting:
| Type of plastic | Marking | Painting features | Examples of parts |
|---|---|---|---|
| ABS (Acrylonitrile butadiene styrene) | 🔣 ABS or AB |
Holds paint well, but requires priming adhesion primer (for example, APP Primer 1K). Without primer, the paint will peel off in 2-3 months. | Bumper Ford Focus, radiator grilles Hyundai Solaris. |
| PP (Polypropylene) | 🔣 PP or 05 |
Weak adhesion - a special primer for polypropylene is required (PP Primer) or processing flame (industrial method). The paint comes off in layers without preparation. | Arch covers Renault Logan, bumper Lada Vesta. |
| PVC (Polyvinyl chloride) | 🔣 PVC or 03 |
Sensitive to solvents - primer and paint must be on water based. Acetone or white spirit will dissolve the surface. | Door seals, decorative moldings Volkswagen Tiguan. |
You can determine the type of plastic by the markings on the back of the part (usually in the form of a triangle with numbers) or using combustion test:
- Break off a small piece of plastic from an invisible part of the part.
- Light it with a lighter:
- ABS: burns with a yellow flame with black smoke, smells like rubber.
- PP: burns with a blue flame, almost no smoke, smell of paraffin.
- PVC: does not burn, but melts, emitting white smoke with a pungent odor.
If there is no marking and a combustion test cannot be carried out, use universal primer for plastic (for example, Rust-Oleum Plastic Primer). It is suitable for all types but requires double application.
Top 7 materials for painting black plastic cars
The choice of paint depends on the budget, required durability and operating conditions. For temporary restoration (for 1-2 seasons) aerosols are suitable, for long-term results (3-5 years) - professional polyurethane systems. Below is a rating of materials in terms of price/quality ratio, based on tests Autoreview and reviews from Drive2.
- 🥇 MOTIP Dupli-Color Plastik 70 (Germany): acrylic paint with a UV filter, durability 3+ years, price ~800 rubles/can. Suitable for ABS and PP after primer.
- 🥈 Plasti Dip Black (USA): liquid rubber, removes without leaving marks, durability 1.5-2 years, ~1200 rub/liter. It is not afraid of vibrations, but is erased by gasoline.
- 🥉 PPG D8115 (USA): polyurethane enamel for professionals, durability 5+ years, ~3500 RUR/liter. Requires a spray booth and drying at 60°C.
- 4️⃣ Krylon Fusion All-In-One (USA): paint + primer in one can, durability 2 years, ~900 rub. Ideal for beginners.
- 5️⃣ APP Black Matt (Russia): matte paint for plastic, durability 2-3 years, ~600 rub. Fits well PP.
- 6️⃣ Rust-Oleum Plastic (USA): universal paint for all types of plastic, ~750 rub. Takes longer to dry (24 hours).
- 7️⃣ Bosny Black Plastic Paint (China): budget option (~400 rubles), durability up to 1 year. Suitable for temporary repairs.
⚠️ Attention: Paint based nitrocellulose (for example, some cans NOVOL) are not suitable for plastic - they shrink and crack after 3-6 months. Always check the ingredients on the label!
Step-by-step instructions: how to paint black plastic with your own hands
The technology for painting plastic differs from metal - surface preparation is critical here. Failure to comply with even one step will result in paint peeling. Below is a step-by-step algorithm tested in detail Skoda Octavia and Nissan Qashqai.
1. Dismantling and cleaning the part
Remove the plastic part from the car (if possible). If dismantling is difficult (for example, a bumper), tape adjacent surfaces masking tape and covering film. Clean the plastic:
- 🧽 Remove dirt and grease antisilicon (for example, APP Cleaner 750).
- 🧼 Wash the part car shampoo with pH 5-7 (for example, Karcher RM 539).
- 🔥 Treat the surface degreaser based on isopropyl alcohol.
2. Sanding and matting
Smooth plastic has weak adhesion - it needs to be roughened. Use:
- 📏 Sandpaper P320-P400 for rough processing (deep scratches).
- 🧴 Scotch-Brite (gray or red) for final matting.
After sanding, degrease the surface again and wipe sticky napkin to remove dust.
Dismantle the part or protect adjacent surfaces|Clean from dirt and grease with anti-silicone|Sand with P320-P400 sandpaper|Degrease with isopropyl alcohol|Apply adhesive primer (for PP/ABS)|Dry for 15-20 minutes at +20°C-->
3. Priming
For ABS and PP required adhesive primer (for example, APP Plastic Primer or Dupli-Color Haftprimer). Apply in 1-2 layers with drying time between layers for 10 minutes. For PVC use water-based primer.
4. Painting
Apply paint from a distance of 20-25 cm in thin layers (2-3 layers with drying for 15 minutes between them). For matte effect use non-gloss paint (eg APP Black Matt). For gloss after painting, apply 1-2 layers of autovarnish (for example, Mobihel Topcoat).
5. Drying and polishing
After painting:
- 🕒 Dry the part for 24 hours at +20°C (or 2 hours at +60°C in the chamber).
- 🔦 After 48 hours, polish the surface abrasive paste (for example, 3M 09374) to remove shagreen.
What to do if the paint runs?
If smudges appear on a freshly painted surface, do not touch them until they are completely dry (24 hours). Then carefully cut off the smudge stationery knife and sand the area with P1000-P1200 sandpaper. Then re-paint in 1 layer.
Common mistakes and how to avoid them
Even when using high-quality materials, incorrect technology leads to defects. Here are typical mistakes and their consequences:
| Error | Consequence | How to avoid |
|---|---|---|
| Painting without primer PP | The paint comes off in layers after 1-2 months. | Always use adhesive primer for polypropylene. |
| Low temperature drying | The paint remains soft and scratches easily. | Dry at +20°C for at least 24 hours or use IR drying. |
| Applying a thick layer of paint | Drips and orange peel. | Apply 2-3 thin layer with interlayer drying for 10-15 minutes. |
| Using nitro paint | Cracks after 3-6 months due to shrinkage. | Choose acrylic or polyurethane paints |
⚠️ Attention: If after painting there are microbubbles, which means the surface was poorly degreased. Remove paint wash (for example, ABRO PR-600) and repeat the process.
Comparison of methods: painting vs. restoration of black plastic
Painting is not the only way to return plastic to its original appearance. Alternative methods:
- 🔥 Thermal recovery: heating the plastic with a hair dryer to 80-100°C returns the color by 60-70%, but the effect lasts 3-6 months. Suitable for PP and ABS.
- 🧴 Revitalizing gels (for example, Sonax Plastic Restorer): fill microcracks, add shine, but do not mask deep scratches. The effect is 4-8 months.
- 🎨 Vintilation: applying black wax (for example, Collinite 845) for temporary protection. Lasts 1-2 washes.
- 🔄 Complete replacement of a part: relevant if the plastic has crumbled or has through cracks.
The choice of method depends on the condition of the plastic:
- 🆗 Mild burnout (loss of shine) → restoring gel or wax.
- ⚠️ Deep scratches, cracks → painting or replacement.
- ❌ Delamination, crumbling → replacement only.
Painting plastic pays off if the part costs more than 5,000 rubles. In other cases, it is cheaper to buy a new or used one in good condition.
FAQ: Frequently asked questions about painting black plastic
Is it possible to paint plastic without a primer?
Theoretically it is possible, but only if you use it paint with adhesive additives (for example, Krylon Fusion). However, on PP (polypropylene) even this paint will last no more than 6 months. For a guaranteed result, primer is required.
How many layers of paint should I apply?
Optimal - 2-3 thin layer with interlayer drying for 10-15 minutes. One thick layer will cause smudges, and four or more can lead to cracking due to internal stresses.
How to paint plastic without removing the part from the car?
1. Tape adjacent surfaces masking tape and covering film.
2. Clean the plastic antisilicon and polish Scotch-Bright.
3. Apply primer and paint brush (for hard to reach places) or mini spray gun with compressor.
Important: when painting a car, avoid days with high humidity (more than 70%) - condensation will ruin the result.
How to paint plastic so that the paint does not peel off in winter?
For resistance to frost and reagents, choose polyurethane paints (for example, PPG D8115) or acrylic with UV filter (MOTIP Dupli-Color Plastik 70). After painting, be sure to apply 1-2 layers car polish for added protection.
Can automotive enamel be used on metal on plastic?
No, regular car enamel (for example, Vika or Sadolin) is not suitable - it does not have adhesion to plastic and will peel off in 1-2 months. The exception is enamels marked "for plastic" or "flexible".