Painting a body yourself is an ambitious task that requires not only financial investments, but also enormous patience. Many car owners decide to take this step, wanting to save on the services of a professional painter or get complete satisfaction from the work done. However, you should immediately understand that the quality of the final result depends 90% on proper surface preparation, and not on the paint spraying process itself.
The process of restoring paintwork (paintwork) includes many steps, skipping any of which can lead to defects such as shagreen, drips or peeling of the material. You will need an equipped room, high-quality tools and knowledge of technology for working with chemical compounds. In this article we will analyze each stage in detail in order to minimize risks and get a decent result.
Before you start purchasing materials, you need to evaluate the scope of work and choose a suitable location. The garage should be clean, dry and well lit, as any speck of dust that gets on the fresh paint will ruin the appearance. If you plan to paint the entire body, then having a spray booth or a perfectly prepared box becomes critical.
Necessary tools and materials for work
High-quality painting is impossible without the right tools. Your main “weapon” will be the spray gun, the characteristics of which determine the uniformity of the spray and the size of the drop. Cheap models often spit and produce an uneven layer, so you shouldn’t skimp on this element - it’s better to rent a professional HVLP or LVLP gun or buy a reliable option.
In addition to the sprayer, you will need a powerful compressor with a receiver capable of delivering stable pressure without surges. For surface preparation, orbital sanders (DAUALE-action) are indispensable, as they allow you to avoid scratches and ensure perfect smoothness. Also prepare a set of sandpaper of various grits, degreaser, adhesive wipes and personal protective equipment.
- 🛡️ Respirator with carbon filters - protecting your respiratory system from toxic solvent fumes is priority number one.
- 🔦 Halogen or LED lamp - necessary to identify minor defects and control the quality of grinding with side lighting.
- 🧴 Masking tape and covering paper - allow you to protect glass, rubber seals and chrome elements from paint.
- ⚖️ Measuring containers and funnel filters - needed for precise mixing of components and cleaning paint from debris before pouring into the tank.
⚠️ Attention: Do not use common household solvents (acetone, white spirit) for degreasing before painting. They may leave a greasy film or react with the primer, causing defects. Use only specialized anti-silicones.
Preparing the body and removing old coating
The initial stage is the most labor-intensive and dirty. Your task is to completely remove old paintwork, rust and dirt down to the metal. If the damage is local, you can limit yourself to partial cleaning, but for an ideal result it is better to remove the paintwork from the entire part or panel. Mechanical cleaning is carried out using a grinder and sandpaper.
To remove thick layers of old enamel or blistered paint, chemical removers are effective. After applying the composition, the old coating softens and is easily removed with a spatula. However, after chemical treatment, the metal must be thoroughly washed and neutralized, otherwise the remaining reagents can provoke corrosion under the new layer of paint.
Pay special attention to hidden cavities and edges where moisture often accumulates and corrosion begins. If you find rust through, you will need to cut out the damaged area and weld in a repair insert or use fiberglass with an epoxy compound. The surface must be completely dry and clean before proceeding to the next step.
How to remove bitumen stains?
To remove stubborn bitumen and tar, use a special bitumen stain cleaner. Apply the product onto a napkin or directly onto the stain, wait 1-2 minutes until the composition dissolves the bitumen, and carefully rinse with a stream of water or wipe with a clean rag. Do not rub the dry surface to avoid scratching the metal.
Putty, sanding and priming
After stripping the metal, irregularities inevitably appear that need to be leveled. For this purpose, automotive putty is used. It is important to apply it in thin layers, allowing each layer to dry completely. Overheating or too thick a layer can lead to cracking of the material during operation.
Grinding of the putty is done gradually, reducing the grain size of the abrasive. You should start with P80-P120 to shape the geometry, then move to P180-P240 to smooth out the marks. You can control the evenness of the surface using developing powder or spray paint developer, which will show all the holes and bumps.
The next step is applying primer. Primary primer (acidic) is applied to bare metal to protect against corrosion, secondary primer (acrylic) creates an adhesive base for paint and fills micro-scratches. The primer also requires sanding, usually with P400-P600 abrasive for enamel or P800-P1000 for base.
| Material type | Grinding grain | Drying time (20°C) | Purpose |
|---|---|---|---|
| Putty | P80 → P240 | 20-30 min | Geometry Alignment |
| Acidic soil | Cannot be sanded / P500 | 15-20 min | Anti-corrosion protection |
| Acrylic primer | P400 → P800 | 3-4 hours | Adhesion and filling |
| Base paint | Can't be sanded | 10-15 min | Color and decor |
When sanding large surfaces (hood, roof), be sure to use a sanding block or a hard pad. Sanding by hand repeats all the irregularities with your finger, and you may not notice the hole that will become visible after painting.
Paint and varnish application technology
The most crucial moment is applying the enamel. The paint must be diluted with a solvent in the proportion specified by the manufacturer on the can (usually 10-20%). It is important to use a solvent that matches the room temperature: fast for cold, slow for hot, to avoid boiling or taking too long to dry.
The material should be applied in 2-3 layers. The first layer (spray) is made thin to ensure adhesion. The second and third layers are applied more richly, but without overflowing, to avoid drips. The movements of the gun should be smooth, parallel to the surface, overlapping the previous pass by 50%. Between layers it is necessary to withstand interlayer drying (usually 10-15 minutes).
If you use the “base enamel + varnish” system, then after the base has dried (it becomes matte), varnish is applied. The varnish is also applied in 2-3 layers. It is the varnish that protects the color from fading and gives depth. After the final coat of varnish is applied, the car is left to dry. Some varnishes may require heat to cure, but most modern materials dry naturally.
⚠️ Attention: It is strictly forbidden to open doors or create a draft while drying a freshly painted part. The air flow can bring in dust or cause uneven drying, causing the polish to become cloudy.
☑️ Ready for painting
Possible defects and ways to eliminate them
Even experienced craftsmen sometimes have defects, not to mention beginners. One of the common problems is shagreen (orange peel). It occurs due to incorrect paint viscosity, too much distance of the gun from the surface, or insufficient pressure. Small shagreen marks can be removed by polishing; large ones will have to be sanded off and repainted.
Drips (paint sagging) occur when you move your hand too quickly or use too much material. You can try to cut off small drips with a blade after complete polymerization and polish them. Large sagging requires local grinding down to metal and repainting the area. Craters (“fish eyes”) appear due to silicone or oil, which requires a complete repainting of the element.
Dullness or “whiteness” of the varnish often indicates moisture getting into the paint or condensation from the compressor. To avoid this, keep an eye on the dehumidifier and do not paint in damp weather without heating the room. It may also be due to the use of a quick solvent in a cold garage.
What to do if the paint bubbles?
Bubbling (boiling) indicates that the solvent did not have time to leave the lower layers. This happens when the layers are too thick or there is not enough drying between them. It can only be treated by completely removing the coating, thoroughly drying and repainting at regular intervals.
Final polishing and maintenance of the new coating
After complete drying (at least 2-3 weeks to gain hardness, although you can use it after a couple of days), the surface often has fine shagreen or dust. To achieve a mirror finish, abrasive polishing is necessary. They start with a coarser abrasive (P1500-P2000), carefully removing defects, then move on to polishing compounds (abrasive pastes) of varying degrees of grain size.
Polishing is carried out using a polishing machine with soft wheels. It is important not to overheat the varnish when working at high speeds, especially on sharp edges of parts where the coating is thin. After the abrasive, a protective polish or ceramic coating is applied, which will enhance the hydrophobic properties and color depth.
Caring for a freshly painted car in the first months should be gentle. It is not recommended to wash the car with aggressive chemicals, use automatic brush washes or spray with hot water under high pressure. Allow the materials to completely harden, and then your work will delight the eye for many years.
The quality of polishing determines 50% of the visual perception of painting. Even perfectly applied paint without polishing will look dull and grainy.
How long does paint dry on a car at 20 degrees?
Drying time depends on the type of paint. Acrylic enamels dry “touch” in 30-60 minutes, but gain full hardness in 24 hours. The varnish polymerizes superficially in 1-2 hours, but it takes 7-14 days to reach its final strength. In cold weather, drying time increases by 2-3 times.
Do handles and moldings need to be removed before painting?
Ideally, yes. Removing all elements allows you to paint the ends and avoid visible boundaries (“steps”) of paint. If removal is not possible, use good quality masking tape and carefully tuck the edges, but the result will be worse than completely disassembling it.
Is it possible to paint a car in an unheated garage in winter?
Strongly not recommended. Below +15°C, most materials will not cure correctly, resulting in peeling, dullness and long drying times. There is also a high risk of condensation. It is necessary to heat the room to +20...+25°C.