Metal structures, whether forged doors, garage doors or frame elements, are constantly exposed to aggressive environmental influences. Moisture, temperature changes and mechanical damage quickly destroy unprotected material. Hammer paint It is one of the most effective solutions for protecting such surfaces, creating a durable decorative layer with a characteristic texture.
The uniqueness of this coating is not only in the aesthetics resembling coinage, but also in high anticorrosion properties. Unlike conventional enamels, this material can often be applied directly to rust, which greatly simplifies the restoration process. Alkyd or acrylic Bases with the addition of aluminum powder provide durability comparable to powder spraying.
However, to get the perfect result, it is not enough to just open the jar and take a brush. Application technology requires compliance with certain rules for the preparation and selection of the tool. In this article, we will discuss in detail how to properly prepare the surface and apply the coating so that it lasts for years without losing its properties.
Advantages and features of hammer coatings
The main feature of this material is its ability to hide surface defects. After drying, a relief pattern is formed, which visually masks small scratches, irregularities and remnants of corrosion. It does. hammer enamel is ideal for products that cannot be perfectly polishedFor example, for old grilles or complex forged decor.
The composition of such paints is usually based on alkyd resins, epoxy or acrylic components, where special fillers are added. It is aluminum powder or glass crumble that creates the very effect of "shagrain skin". In addition, the formula often includes silicones that increase water repellent properties and resistance to ultraviolet light.
The key advantages of using this type of metal protection are:
- 🛡️ High adhesion to rusty and smooth surfaces without mandatory priming.
- 🌡️ Thermal resistance, allowing the use of coating on heating devices and exhaust systems.
- ⏱ Fast drying, which speeds up the process of work several times compared to classic oil paints.
It is important to note that modern compositions are more environmentally friendly than their predecessors. SolventsThe nutrients used in them are less toxic, and the layer itself becomes inert after polymerization. This allows you to use the material even for interior work, for example, for painting radiators or metal doors in the apartment.
Required tools and materials
The quality of the finishing coating depends on what you will apply it to. To work with viscous hammer enamels, a regular set of painter may not be suitable. The main tool is most often a brush with natural bristles, since synthetics can be dissolved by aggressive paint components.
If you plan to handle large areas, such as a garage door or a metal fence, it is advisable to use a spray gun. However, there is a caveat: the pressure must be strictly controlled so as not to blow away the pattern that is forming. Short-pile rollers will also be needed, although they give a less pronounced texture.
The complete list of necessary equipment includes:
- 🖌️ Natural brushes (fluent) for hard-to-reach places.
- 🔫 Pneumatic or electric with adjustable torch.
- 🧽 Solvent (white spirit, solvent or specialized composition of the manufacturer).
Don’t forget about personal protective equipment. Solvent vapors can be harmful, so having a respirator and gloves is a must. Also prepare rags for degreasing and sandpaper of different grains for pre-treatment of the metal.
Preparation of surface for staining
Although hammer paints are positioned as materials that allow applying to rust, it is still not worth ignoring the preparation stage. The cleaner the base, the longer the protective layer will last. First, it is necessary to remove flaky pieces of old paint and loose rust mechanically.
To do this, use a metal brush, scraper or grinder. If there are greasy spots or traces of oils on the metal, they must be degreased. Then the surface is rubbed with a stained stain. white spirit or acetonePaying special attention to welded seams and corners.
☑️ Training checklist
Particular attention should be paid to smooth metal. If you paint a new sheet or a chrome-plated part, adhesion may not be enough. In such cases, it is recommended to pre-approach a special soil for non-ferrous metals or create roughness with the help of abrasive.
⚠️ Warning: Never apply paint to a wet surface or metal whose temperature is below the dew point. This will cause the coating to swell and detach shortly after drying.
After mechanical cleaning and degreasing, the surface should be completely dry. If you work in a room with high humidity, let the metal warm up to room temperature before work begins.
Technology of applying paint with a brush and roller
Hand-painting of hammer paint is the most common method for small products and parts of complex shapes. The main rule here is not to strive for a perfectly smooth elephant, as when working with varnish. Texture is formed precisely due to the uneven distribution of the material.
The paint is applied in two or three layers. The first layer may be thin to provide adhesion. The second layer is applied more abundantly, and it is at this point that the pattern begins to appear. The movements of the brush should be confident, but do not "carry" in one place many times, otherwise the effect of the hammer will disappear.
When using the roller, the technique changes. The roller allows you to quickly cover large flat areas, but gives a less deep relief. To enhance the effect, you can after rolling roller slightly "pierce" the surface with a dry brush or use a roller with a harder pile.
It is important to observe the time intervals between layers. Usually the manufacturer indicates the drying time "on the stick", but for full polymerization of the next layer, it is better to wait longer. If you hurry, the solvent from the bottom layer can bulge the top.
Staining with spray gun
Using pneumatic spraying allows you to get the most professional result with a uniform distribution of texture. However, this method requires fine-tuning of the equipment and proper dilution of the material. Too thick paint will clog the dusa, and excessively liquid will flow.
To work with a spray gun, hammer enamel must be diluted to working viscosity. Usually, this ratio is 9:1 or 8:2 (paint to solvent), but the exact proportions are always listed on the label of a particular brand. The mixture must be thoroughly mixed and strained through a filter funnel to exclude the ingress of lumps into the sprayer.
Setup parameters for the optimal result:
- 💨 Output pressure: 2-3 atmospheres (depending on viscosity).
- 📏 Duse diameter: 1.5 to 2.0 mm for standard formulations.
- 🌡️ The temperature of the mixture is 20-25 ° C (cold paint is more difficult to spray).
The application technique consists in spraying with a "fog" from a distance of 15-20 cm. You do not need to try to paint the surface from the first pass to opacity. It is better to make several thin layers, allowing each to dry. The pattern will manifest itself in the process of evaporation of the solvent.
Comparison of methods and material consumption
The choice of the method of application affects not only the appearance, but also the economic efficiency of the work. The consumption of material with different methods can differ in one and a half to two times. Below is a table that helps you navigate costs and labor costs.
| Method of application | Expenditure (g/m2) | Texture quality | Difficulty |
|---|---|---|---|
| Brush | 100-120 | Expressed, large | Low. |
| valik | 80-100 | Medium, homogeneous | Low. |
| Krascopult | 60-80 | Small, factory-made. | Tall. |
| aerosol | 90-110 | Medium | Low. |
As can be seen from the data, spray gun is the most economical way, but requires the presence of a compressor and skills. The brush gives the greatest consumption, but allows you to better paint the corners and relief elements of forging, where the roller can not reach.
⚠️ Attention: When working with a spray gun in the room, powerful ventilation is required. The cloud of paint does not settle for a long time and can ignite from a spark at a distance of several meters.
For a home craftsman who paints one wicket, the best choice will be a brush or a ready-made aerosol can. If the plans are to handle the entire fence or garage gate, renting or buying a simple electric spray gun will pay off with the saved material and time.
Drying and final polymerization
The process of drying hammer paint takes place in several stages. First, the solvent evaporates, and the surface ceases to be sticky ("on the stick"). This happens quite quickly, usually within 30-60 minutes at a temperature of +20°C. However, this does not mean that the coating is ready for use.
Full polymerization, when the layer is gaining maximum hardness and chemical resistance, takes from 24 hours to several days. At this time, it is not recommended to expose the product to mechanical stress, wash it or install seals that can stick.
Factors affecting the drying speed:
- 🌡️ Air temperature (optimally +15 ... +25 ° C).
- 💧 Humidity (no more than 80%).
- 🌬️ Air circulation (the draft speeds up the process).
If you painted the product in the cold, the drying process can be delayed indefinitely, and the quality of the coating will deteriorate. Winter work is possible only with the use of special heat-resistant compounds or in heated rooms.
Frequently Asked Questions (FAQ)
Can I apply hammer paint over old oil paint?
It's not recommended. Oil paints have weak adhesion and often exfoliate. Hammer enamel, drying and creating tension, will simply tear the old layer with it. The old coating must be completely removed to the metal.
Do I need to ground metal before painting?
If the metal is clean and new, it is desirable to use soil to improve adhesion. If the surface has traces of corrosion, many modern hammer paints (3-in-1) contain a rust converter and soil, so separate priming is not required. Read the instructions on the bank.
How to dilute thickened hammer paint?
Use only those solvents that the manufacturer recommends. Most of the time, it's solvent, xylon or white-spirit. Acetine can be too aggressive and disrupt the structure of the resin, which will spoil the effect.
How do you remove the stains if they are formed?
If the paint has not yet dried, you can gently rub the flows with a dry brush. If the layer has already been grasped, you will have to wait for full polymerization, clean the defect with sandpaper and repaint the site again.