Acrylic anticorrosive primer-enamel

Peculiarities

Acrylic primer enamels are designed to paint a metal surface, including:

• vehicles;
• infrastructure facilities;
• Agreecultural machines. Agreecultural equipment;
• other items and objects for which solid decorative characteristics and a long service life are important.

Decent physical and chemical parameters, excellent aesthetic qualities, combined with a solid covering ability and ease of application, make such formulations one of the best.

After drying, the primer-enamel turns into a strong coating that is resistant to the negative effects of atmospheric processes. It retains its shine for a very long time, does not lend itself to impacts and various deformations.

There are many types of such enamels on the market, which differ in color.

Advantages and disadvantages

The most important advantage and, in fact, the reason for the creation of such a composition is its plasticity after drying, which allows such a coating to withstand temperature drops. Simply put, after severe frosts, the composition does not crack, and in extreme heat it can stretch slightly without disturbing its structure.

Advantages of acrylic coating:

• retains color well, while materials that are constantly exposed to the sun can be coated with an acrylic emulsion (for example, a window sill treated with such a composition will not lose its color for a very long time);
• adheres well to the material and, after drying, becomes elastic (it can be added that the surface does not crack over time, as sometimes happens with other coloring compositions, and an anti-corrosion emulsion is produced for metal, which protects its surface from various influences);
• a sufficiently long service life for the dye - almost 20 years for metal, for wood - 8 years;
• does not react with oils or harsh chemicals.

Of the obvious shortcomings, one can note the high price and one of the most common problems in the modern market - the likelihood of purchasing a fake.

It is not enough just to wipe it with a dry cloth, you need to treat everything with a special degreasing compound. Without this step, the subsequent result from the application of the enamel may come to naught.

Preparation for work

Ease of application does not mean that you can completely ignore the preparatory stage. The metal surface should be free of any stains, water-soluble deposits, traces of grease and oil. To get rid of these contaminants, use aromatic solvents (solvent, acetone, and so on) with which the rags are impregnated

It is important to check the substrate to ensure it is clean and dry. Cleaning can be done by hand, power tool, shot blasting or sandblasting

The initial coating is often sufficiently strong and free of corrosion defects (with destruction of no more than 20% of the surface). Then only the deformed areas need to be processed. Otherwise, you need to clean the backing and fully cook the metal object.

Anticorrosive runt-enamel must be well mixed, and in some cases the solution must be diluted to the required viscosity.

Its meaning is as follows:

• when painting with brushes and rollers (60 seconds according to the viscometer);
• for aerosol spraying - from 25 to 30 seconds;
• when spraying in a vacuum - from 40 to 60 seconds.

Slaven quick-drying anticorrosive primer-enamel

Advantages and disadvantages

Let us consider in more detail the advantages and disadvantages of the material that are common to all manufacturers.

The indisputable advantages of primer-enamel over classic protective coatings (meaning primer GF-021 and enamel PF-115) include the following points:

1. Surface preparation when using an anti-corrosion compound is greatly simplified. Its application does not require a thorough cleaning of the areas affected by rust and additional surface treatment with a special modifier, followed by its neutralization with a soda solution. The primer-enamel can be applied even to residual rust, it is enough to remove the peeled coating and loose corrosion formations from the treated surface.
2. The decorative and protective properties of the material are noticeably higher than that of alkyd coatings. Alkyd-urethane varnish, acting as a binder, has greater hardness, wear resistance and is less susceptible to moisture and aggressive media than alkyd varnish used in primers such as GF-021 and PF-115 enamel.

To ensure reliable anticorrosive protection within 5 years, it is necessary to apply one coat of primer of the GF type and two coats of PF-115 enamel, while the primer-enamel should be applied in two coats. When three layers are applied, the service life of the decorative protective coating increases to 7 years.

1. The use of the material can significantly reduce the time of painting. It should be recalled here that the primer GF-021 dries up within 12 hours, and one layer of PF-15 enamel is completely polymerized in 24 hours.Thus, to obtain a protective coating it will take: 12 + 24 + 24 = 60 hours.

One layer of the composition at an ambient temperature of 20C does not exceed 6 hours, which allows complete painting work in 12 hours.

1. All components of the protective coating (rust modifier, primer and enamel) are in one can, which greatly simplifies their application and reduces the amount of tools required.

The main, and perhaps the only drawback of primer-enamel is their high cost, however, upon closer examination, this drawback turns out to be rather doubtful. The fact is that the estimate of painting work takes into account not only the price of the material. It also takes into account the cost of preparatory work and the application of each, separately taken, layer.

When using this composition, the preparatory work is greatly simplified, and the protective and decorative coating itself is applied not in three, but in two layers, therefore the total cost of the work differs slightly.

How to paint?

Primer-enamels are applied in one or two layers, when the temperature in the room is not less than +5 and not more than + 35 degrees, and the air humidity does not reach 80%. Each layer is made with a thickness of 30-40 microns. When two coats are applied, the coating should be applied at intervals of 15 minutes. At the same time, for each layer, from 0.1 kg per 1 square meter are consumed.This means that an ordinary container with a capacity of 25 kg should theoretically be enough for 250 m2.

The group "wagon" includes an acrylic primer-enamel type AK-100, which helps electrochemical protection of metals. Thanks to this, the surface is reliably covered from the action of destructive atmospheric processes, from contact with fresh and salt water. This type of primer enamel contains zinc and silver. If the paintwork is deformed, a galvanic combination of metals appears, which can reduce the corrosion rate by 10-40 times (compared to the corrosion rate of pure steel).

The advantage of the AK-100 is also the absence of the need for auxiliary equipment, as well as savings in labor costs. Any kind of enamel can be applied on top.

For an overview of the Spetsnaz rust remover, see the video below.

FAQ

1. Do I need to prepare the surface and clean for paint application if the product is rusty and has some defects? How do rust compounds work?

The composition of paints "against rust" contains fatty acids, which neutralize the process of rust spreading, and the protective layer preserves the product. But, since the surface of the metal with traces of rust is porous, it is better to carry out a little preparation of the metal. To do this, go over the surface with sandpaper or other abrasive material, wipe the product dry with a cloth and degrease acetone or alcohol.

2.How does ink density affect consumption? What other indicators of paints should be considered when calculating the consumption?

The higher the density of the paint, the more firmly and completely the initial surface of the metal will overlap. The hiding power is indicated by the manufacturer for ideal conditions, therefore it is better to take a correction factor of 1.3 (multiplying the calculated amount of the composition). In this case, we can accurately calculate the flow rate. But, even the best paint will not cover the initial surface in one layer, only if this is a new product without flaws.

3. It is necessary to paint a surface that heats up to significant temperatures (metal oven). What kind of high temperature paint can be used, and how do they differ from ordinary enamels?

When choosing a heat-resistant paint, we focus on the operating temperature indicator at which the coating will not deteriorate and retain its original characteristics. On average, the compositions can withstand 400-600 ° C, which is enough for painting a metal oven. Silicone resin paint is suitable for your application.

4. How to remove old paint from metal surfaces?

There are three main ways to remove old paint from metal surfaces. First, the mechanical method. The layer is removed with an abrasive, but the effect can be obtained only on relatively flat surfaces.

Good results are obtained when using cord brushes on a drill or flap emery wheels on a grinder. Look carefully at the maximum speed markings on the brushes, use thick canvas gloves, goggles and a respirator or face shield.

Secondly, the chemical method. We purchase a gel or liquid composition that is intended for these purposes and apply to the surface with a brush. The composition is very active, you should work with plastic gloves and a protective apron. Glasses are required. The tool eats up rubber products in 2-3 minutes.

The compositions are a complex composition of chemically active substances. As a rule, manufacturers include in the solution: complexing agents, corrosion inhibitors, alkalis (or acids), surfactants.

And, the third way is fire. Using a blowtorch (not a cutter), heat the surface before burning the paint. The main thing here is not to overheat the metal, otherwise it will deform. After processing with fire, we clean the remnants of the paint layer with an abrasive or a metal brush.

5. I heard that there are so-called “grounds”. How do they differ from paintwork for metal? Are they a complete replacement for metal coatings? In what cases is it necessary to use a primer and is it necessary to “put” a layer of high-grade paint on top of the primer?

The primer is intended for the primary coating of metal and the formation of a protective layer before applying the decorative composition. "Primer" provides protection against corrosion, evens out defects, creates a solid base for enamels. The primer blocks dirt that cannot be cleaned from the surface.

The primer differs from paint and varnish coatings by the presence of special complexes in the composition, which prevent rust from developing and protect the metal from moisture penetration. Nevertheless, paints are now produced that "work" no worse than primers (3 in 1).

As a rule, the primer is produced in one color, often “brick” or other not very attractive matte color. You can use only a primer when painting if you the aesthetic component of the external is not important type of product. The selected paint is applied in two coats for a shine and an even coating on the ground.