The composition of refractory primers and the rating of the best brands, the rules of application

The use of a primer is necessary to increase the parameters of adhesion of the base with the finishing or building material. The substance helps to strengthen the surface of walls, ceilings and floors. After using it, you can apply paint, wallpaper, plaster. But sometimes you have to deal with high temperature objects. In such a situation, it is worth using a special heat-resistant primer. It offers a quality finish and is fire resistant.

Heat-resistant primers: composition and properties

Primer is used to strengthen and remove dust from the base. With its help, it is possible to prepare the coating for the application of compounds of different density and viscosity. The heat resistant material is applied in the same way as usual. Its main difference is the composition.Instead of conventional resins, adhesives and oils, the mix includes polymers and acrylics, which are resistant to high temperatures.

Thanks to this composition, it is possible to prepare fireplaces, stoves, barbecues for the application of decorative finishing agents. In addition, the use of high-temperature enamel allows you to achieve an even coating without cracks and chips.

Applying a primer saves building materials. When working with fireplaces and stoves, it gives the degree of adhesion required for the application of plaster or other substances. Without a bonding agent in the form of a primer, cracks appear over time on the surface of enamel, bricks or plaster.

where is used

Heat resistant primer is used in various fields. In this case, it is important to choose the right composition, taking into account the operating conditions.

Certificate of conformity and allowable temperatures

To prevent heat-resistant primer mixtures from losing their properties, it is important to monitor the temperature regime. In this case, the following options are possible:

• Temperature parameters do not exceed +600 degrees. By all standards, such a temperature is typical for items used to equip the autonomous heater. Some deviations are also possible - from +500 to +700 degrees. In this case, it is permissible to use ordinary flooring, which does not have heat-resistant characteristics. At the same time, don't worry that defects will appear later, such as dye delamination or loss of its tint.
• The devices heat up to +1000 degrees. In such situations, it is also permissible to use materials that do not differ in their special thermal properties.However, it is advisable to take into account the level of stability of the pigments. At this temperature, there is a risk of discoloration of the paint.
• The temperature is + 1000-3000 degrees. In this case, it becomes necessary to use special pigments adapted precisely to these conditions. In this case, the use of the floor can spoil the situation. In this operating mode, the applied primer coat causes the dye to peel off.

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Thus, the choice of a heat-resistant primer is directly influenced by the heating temperature of the object to be painted.

Material efficiency and benefits

Many people are interested in whether to prepare the surface for heating. To determine it, it is worth getting acquainted with the main features of the operation of the products.

Through the use of special primers, the following results can be achieved:

• Increases the adhesion of the dye to the surface. Many types of primer have a high level of adhesion. In addition, they increase the adhesion properties of the painted surface itself. Due to the application of a primer, a film appears on metal parts exposed to heat. It resists dissolving during dye application.
• Protect the surface from corrosion. The heat resistant primer helps prepare the surface for paint application and is itself protective.
• Reduce the cost of dyeing. After applying a heat-resistant primer, a kind of film forms on the object. When using dyes, their consumption is significantly reduced. This feature is important when decorating stoves and fireplaces. The fact is that quite expensive compositions are used to stain them.Therefore, it is so important to perform a high-quality primer, rather than spending a lot of money on paint.

Are there any disadvantages?

High-quality primers have practically no drawbacks. At the same time, some products contain toxic substances that can seriously harm health. Therefore, it is so important to strictly follow the safety rules.

App Features

For clay ovens and fireplaces

When applied to clay ovens and fireplaces, it is important to consider their heating temperature. Depending on this, it is necessary to choose a primer composition. After drying, a polymer film appears on the surface of the product. Volatiles evaporate during drying. There is no smell.

In an ordinary Russian oven, the temperature parameters are + 70-80 degrees. Under these conditions, it is permitted to use conventional primers. If you spray water on the stove and it hisses, it means that the temperature exceeds +100 degrees. In such a situation, you cannot use ordinary household primers and dyes - they easily fall off. As long as the oven does not sizzle, the primer and paint will withstand this condition.

For metal

Heating boilers, radiators, steel pipes and thermal insulation screens are made of metal, which heat up considerably. At the same time, high temperatures should not affect the quality characteristics of surfaces.

For this, it is recommended to use heat-resistant enamels, dyes and primers.

Without the use of a special primer, enamel application will not yield the desired results:

• A rusty surface that contains a lot of small debris will worsen the appearance of the product.Applying a primer will cause small dust and rust particles to adhere. This will make the surface smoother and more even.
• The raw metal will need to be coated with a lot more enamel. Since it has a fairly high cost, metal surfaces are best primed.
• Applying a primer increases the adhesion of the enamel to the metal surface. This prolongs the life and improves the appearance of the surface.

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Experienced craftsmen do not recommend applying enamel without a special heat-resistant primer. With careful treatment of the metal surface, the likelihood of the appearance of oxide stains and corrosion processes is reduced.

Ranking of the best brands

Today, there are many varieties of different heat-resistant primers on sale. They are allowed to be used for stoves and fireplaces, as well as for various metal surfaces exposed to heat. The most common heat resistant products include:

• GF-031. This heat resistant primer is available as a slurry containing antioxidants. The composition is suitable for processing coatings. The permissible threshold is considered a temperature of +200 degrees. A solvent is used as the soil base. It is used as a thinner when the mixture is thicker. This type of soil should be applied by spraying. The mass is yellow.
• "Phosphogrunt". This primer reacts with the coating to form a thin layer of insoluble phosphate. As a result, the degree of adhesion is significantly increased, which helps to prevent surface corrosion processes. The basis of the substance is considered zinc oxide, phosphoric acid, water, alcohol, sodium nitrite, chromium trioxide.The permissible temperature regime is +300 degrees. It is recommended to apply the composition on cleaned surfaces and on rusty objects. Acetone or toluene can be used as primer thinners. The advantage of the product is considered quick drying - it takes no more than half an hour.
• G-77. This heat resistant primer is recommended for stoves and fireplaces. It is characterized by a high degree of thermal stability. The temperature threshold reaches +1200 degrees. This is a significant advantage of the composition over other primer blends.
• AU-1417 R. The lacquer, based on alkyd and a urethane component, is distinguished by maximum ease of use. It contains pigments, rust converters, desiccants that help to dry quickly and solvents. The reagent cannot be called a classic primer, since it leads to the formation of a final coating that does not require staining. The composition is made in different shades that correspond to the international scale. It is allowed to be used to protect various ferrous metal products. At the same time, the agent is characterized by not very good parameters of the thermal stability of the composition. The temperature threshold does not exceed +60 degrees.

How to work with heat resistant primer

For successful application of heat resistant primer, it is important to strictly follow the instructions. In this case, it is strongly recommended to pay attention to the preparatory work and the technique of applying the primer mixture.

Surface preparation

Heat resistant primer can be applied to different types of surfaces - new or not so good. This must be taken into account when carrying out the preparatory work. New products do not need cleaning procedures.

The products that were in the warehouse could be in high humidity conditions. This often leads to corrosion processes. In addition, after storage, metal products are contaminated with dust particles or other impurities. At a minimum, rough cleaning and air circulation of debris is required before applying primer.

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Calculation of the consumption of tools and materials

The following tools are typically required to apply primers:

• spray gun - such a device can process large areas;
• roller - used to apply the primer to medium-sized surfaces;
• brush - necessary for applying a primer to hard-to-reach places.

The consumption of the primer directly depends on its composition and variety. On average, 100-150 grams of substance are needed per square meter. The manufacturer indicates the specific quantity on the packaging. It is generally recommended to apply the product in 2 coats.

Application of a primer coat

It is recommended that the primer be stirred until smooth before use. If necessary, thinners will need to be added to the product. They are selected taking into account the composition and properties of the primer mixture.

After preparation, it is allowed to start applying the product. This should be done in a thin, even layer. After it is completely dry, the procedure must be repeated.

Drying time

The drying time of the primer mixture depends on its composition. In addition, this period is influenced by the parameters of humidity and temperature. At a temperature of +20 degrees, the primer usually dries in 30-60 minutes. If the indicators reach +60 degrees, it takes 10-15 minutes.

Primer Precautions

It is not recommended to apply the primer near open sources of fire, as it may ignite. Many products contain toxic ingredients. To minimize their negative impact on the body, it is mandatory to use personal protective equipment. When using the product indoors, supply and exhaust ventilation must be activated.

Proper storage of primer is important. The mixture should be kept away from sources of ignition. The composition should be in a sealed container. However, it should be protected from heat, humidity and direct sunlight. Usually, primer mixtures can be stored at temperatures from -30 to +30 degrees. The expiry date depends on the manufacturer. On average, it varies from 8 months to 2 years.

What can be replaced?

It is not recommended to replace the heat-resistant primer with other substances. This agent increases the degree of adhesion of paints and varnishes and treatment surfaces. In addition, the use of a primer mixture helps to prevent the appearance of rust on metal surfaces. This is due to the content of corrosion inhibitors in the composition of the product.

Expert recommendations

In order for the use of a heat-resistant primer to be successful, it is important to follow the instructions scrupulously and to respect the advice of experienced craftsmen:

• Choose the right composition depending on the structure of the surface and the conditions of use.
• Pay attention to surface preparation. In order for the liner to lie flat, it must be properly cleaned.
• Pay attention to the drying of the coating. Before applying the second coat, dry the first thoroughly.

Heat Resistant Primer is an effective mixture that helps improve the strength and adhesion of materials. In this case, it is important to choose the right composition and follow the recommendations for its application.