Hammer paint is a unique protective and decorative coating that creates a characteristic relief pattern on the surface, resembling traces from hammer strikes on minted metal. Unlike traditional enamels, it does not require a perfectly smooth base and is often applied directly to rust, making it indispensable for the restoration of car discs, sills, frames and body elements with hard-to-reach places. The secret lies in the special composition, where aluminum powder and silicones create the effect of "shagrene skin" when drying, hiding small defects.
The application technology requires strict compliance with the temperature regime and preparation rules, otherwise the desired "hammer" effect may not manifest itself or go stains. Viscosity of material plays a critical role: too thick paint will lie bougers, and too liquid just drains without leaving the picture. In this guide, we will analyze all the nuances of working with alkyd and epoxy compounds to make your result look professional.
Selection of tool and surface preparation
Before you start, you need to make sure you have the right set of tools at hand. For the application of hammer enamel, a spray gun with a nozzle diameter of 1.5 to 2.0 mm is most often used, although some masters successfully work with brushes or rollers with a short pile. hammerright Other popular brands are often produced in aerosol cylinders for local repair, but for large areas it is more profitable to take the material in banks.
Preparing the foundation is 80% of the success. Despite the statements of manufacturers about the possibility of applying “directly to rust”, deep foci of corrosion are better to clean to metal. Use a petal-circle angle grinder or chemical rust converters. The surface shall be dry, defatted and dust-free.
⚠️ Warning: Never apply paint to a wet or greasy surface – this will lead to flaking of the film after a few months of use.
Degreasing is carried out with special solvents, such as White Spirit or nephras. It is important not to rub the surface too much if there is an old but strong layer of paint on it, so as not to smear the contamination. After degreasing, let the parts dry for 10-15 minutes.
If you plan to paint in multiple layers, make sure the first layer is completely dried. The drying time is usually from 4 to 6 hours at a temperature of +20 ° C, but in the cold season this interval increases. Temperature regime in the paint chamber or garage should not fall below +10 ° C.
Krascopult application technology
Using a pneumatic or electric spray gun allows you to get the most uniform and beautiful relief. The pressure at the exit of the gun should be set in the range of 2-3 atmospheres. Too high pressure will “break” the forming pattern, and the surface will become simply matte or glossy, devoid of characteristic “flakes”.
The first layer is applied very thin, almost "dustful". Its task is to create an adhesive base and initial relief. Don’t try to paint the base the first time. Move your hand smoothly, without jerks, holding the gun perpendicular to the surface at a distance of 15-20 cm.
- 🛠️ Dilute the material to working viscosity (usually 15-20 seconds on the viscometer VZ-246).
- 🔫 Set the spray torch so that it covers the previous pass by 50%.
- ⏱️ Hold the technological pause before applying the second layer.
The second and third layers are applied more abundantly, but without the formation of tears and streams. It is at this point that the main decorativeness. If you notice that the paint lies too liquid and the pattern is not formed, you can add a little (no more than 5%) special diluent for hammer enamel.
☑️ Quality control of painting
It's important to keep your distance. If you get too close, you will create leaks that will spoil the texture. If too far - the paint will dry in flight and lie down "stepping", which will not be spread into a beautiful pattern.
Painting with a brush and roller: nuances
When the spray gun is not available, brushes with natural bristles or velour rollers come to the rescue. This method is ideal for complex nodes, hard-to-reach areas of the car frame or small parts. The main advantage is the absence of fog and material savings, although the texture can be more pronounced and larger.
When working with the brush, the movements should be light, without a strong press. The paint does not need to be “rubbed” into the surface. It is enough to evenly distribute the composition, and then make several vertical movements to align. The hammer enamel has a high thixotropicity, that is, the ability to liquefy under mechanical influence and thicken at rest, which helps to hide traces of bristles.
The roller works faster, but there is a risk of strangulation of the layer. To avoid bubbles, don’t roll around one place too many times. After the initial distribution, walk the instrument in one direction with light touches. It'll form the right pattern.
⚠️ Warning: Do not use foam rollers – they leave small air bubbles on the surface that burst and create craters.
If you work in a room with a low temperature, the paint spreading time increases. In this case, the layer may remain too smooth, without a characteristic pattern. To activate the process, you can slightly warm the part with a building hairdryer, but you need to do this very carefully.
Table: Comparison of application methods
The choice of tool directly affects the consumption of material and the final look of the part. Below is a comparative description of the main methods of application, which will help you determine the tactics of work.
| Parameter | Krascopult | Brush | aerosol |
|---|---|---|---|
| Paint consumption | Medium. | Low. | High-pitched |
| Speed of operation | Tall. | Low. | Medium |
| Quality of relief | fine-grained | Coarse-grained | Medium. |
| Difficulty | Requires skills | Simple. | Simple. |
As you can see from the table, for large areas such as the hood or roof, spraying is best. The brush is indispensable for painting chips and corners. Aerosol cans give the best result only when painting small elements with an area of up to 0.5 m2.
The paint consumption also depends on the color. Light shades (silver, white) often require more layers to cover the base than dark shades (black, green). Always buy material with a margin of 10-15%.
The Secret to the Perfect Drawing
To obtain a larger and more expressive “hammer” experienced masters add to the paint a few drops of silicone oil. However, the proportion must be microscopic (literally 1-2 drops per 100 g of paint), otherwise the adhesion will be lost completely.
Drying time and polymerization
The process of drying hammer paint is divided into several stages. First, the solvent evaporates (the stage "from dust"), then the primary grasping occurs, and only then complete polymerization occurs. At a temperature of +20 ° C, the surface stops sticking after 30-40 minutes.
However, it is impossible to exploit the detail immediately. Full mechanical strength It is collected within 24 hours, and the final chemical resistance and hardness are formed up to 7-10 days. During this period, it is not recommended to wash the part with aggressive chemicals or expose it to blows.
- 🌡️ At +5°C, the drying time increases by 2-3 times.
- 🔥 Forced drying at +60 ° C reduces the process to 1-2 hours.
- 💨 The draft speeds up drying, but can cause the paint to boil.
If you dry the part in the garage in winter, make sure there are no sudden temperature changes. Condensate falling on a cooling surface can muddy the gloss. It is better to bring the painted part into a warm room immediately after applying the last layer.
To accelerate drying in a cold garage without the risk of dusting, cover the part with a plastic film, but not close, but having built a kind of “chater” with a gap of 10-15 cm. It'll create a microclimate.
Frequent errors and ways to fix them
Even experienced craftsmen sometimes face defects when working with hammer enamel. The most common problem is the lack of drawing. This happens if the paint is too liquid or applied too thick. In this case, you need to let the coating dry, grind it and apply a new layer of less thickness.
Another mistake is the appearance of matte spots (“mock”). This occurs when the paint is applied to undried soil or at high humidity. This can be prevented by careful drying of each layer and controlling the humidity in the room. The reason may also be of poor quality. solvent, containing water.
If craters ("fish eye") formed on the surface, then the base was poorly defatted. The silicones or oils left on the metal repel the paint. The defect can only be corrected by a complete repainting after thorough washing and grinding.
⚠️ Warning: Do not try to paint over craters locally – this will highlight the defect even more. You will have to repaint the entire plane of the detail.
Sometimes there is a problem of poor adhesion, when the paint flakes off in layers. This is a sure sign that the degreasing stage was ignored or the application was made on a smooth, unpolished gloss of old paint. Always use abrasives to create your drawings.
The main secret of success with hammer paint is not to try to paint the surface “one pass”. Thin, multi-layered applications give a much better relief and durability than a single thick fatty layer.
Questions and Answers (FAQ)
Can I apply hammer paint to rust without a primer?
Technically, the compositions of the type "3 in 1" allow you to do this, since they contain a rust converter. However, for a car that is operated in an aggressive environment, it is better to clean loose rust and apply a special soil for rust. This will significantly extend the life of the cover.
How to dilute thickened hammer paint?
Use only branded solvents from the same manufacturer or xylene, Solvent. Do not use acetone or 646th solvent, they can roll up the paint components and spoil the hammer effect.
How much dried paint at a temperature of +10 ° C?
At this temperature, the polymerization process is slow. Before the "atlip" layer will dry about 2 hours, and fully dry only after 24-30 hours. It is recommended to warm the room.
Do I need to polish the surface between the layers?
No, you do not need to grind between layers of hammer paint if you observe drying time intervals. The grinding will break the formed relief. If defects (dust) occur on the surface, they are carefully removed with a scalpel, but not skinned.