Features and rating of the best brands of paints for metal furnaces, how to apply

The ovens are made of a material that must withstand extreme temperature variations over the years. Similar requirements apply to the finish that covers exterior walls. At the same time, paints for metal furnaces should also protect the material from moisture and other external factors. Therefore, these compositions contain titanium dioxide and other components found in common paint materials.

Features of paint materials for painting the oven

As noted, the basis of paints and varnishes for the oven is titanium dioxide, which occupies up to 50% of the volume. Thanks to this component, such compositions can withstand heating to a temperature of +1850 degrees.

Titanium dioxide also acts as a binder. This component prevents the paint from breaking down into components and prevents ignition of the treated surface when in contact with an open flame.

Similar paint materials, in addition to titanium dioxide, contain:

• ferrous oxide;
• chromium oxide;
• a liquid base consisting of synthetic or organic substances.

Each component can withstand prolonged exposure to high temperatures.

Requirements for technical characteristics

A high quality heat resistant paint should meet the following characteristics:

• Heat resistance. On the dye packaging, manufacturers indicate the maximum temperature that the protective film can withstand while maintaining its protective and decorative characteristics.
• Anti corrosion. Dyes used to treat metal furnaces must protect the surface from corrosion.
• Moisture resistance. Since metal stoves are often installed in baths and other rooms with high humidity, the paint must withstand prolonged contact with water.
• Nontoxic. When heated, many dyes release substances harmful to health. Heat-resistant enamel should contain non-toxic components.
• Elasticity. Metal expands when heated. During this process, the film must remain intact.

In addition, depending on the operating conditions, when choosing a heat-resistant paint material, it is recommended to give preference to materials with a service life of 5-12 years. The optimal heat-resistant paint is one that can withstand a drop in ambient temperature to negative values.

Recommendations for the choice of paints

For finishing metal furnaces, 3 types of heat-resistant paints are produced:

• Water-based acrylic. These compounds are universal and suitable for finishing copper, steel, brass and many other alloys.Water-based paints are affordable and are used in the treatment of furnaces located in rooms with different levels of humidity.
• Polyurethane varnish or enamel. Such compositions are also well resistant to sudden temperature fluctuations and are suitable for processing metals.
• Organosilicon paints. These paint materials perfectly meet the characteristics set out above. Organosilicon paints do not contain toxic substances and, depending on the composition, can withstand heating up to +900 degrees. But, in comparison with other materials, such compositions stand out at too high a price.

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Heat-resistant epoxy coatings are suitable for finishing ovens exposed to slight heating (up to +400 degrees). These materials are distinguished by a long service life (up to 15 years), resistant to mechanical stress, elastic and prevent the formation of corrosion.

For iron

Iron furnaces are characterized by a relatively short service life. This is explained by the fact that this material, reacting with oxygen, is oxidized. This process is accelerated by regular heating of the iron, which shortens the life of the furnace.

To protect this type of metal, it is recommended to take organosilicon paints. However, when choosing paint materials, it should be borne in mind that this material places strict demands on the application technique. Errors made in the processing of iron will prevent the paint from performing its protective functions and will quickly crack.

For the cast iron

Cast iron is mainly used in the manufacture of so-called stoves. This material is stronger than iron and lasts longer.Cast iron also tolerates regular heating to high temperatures well. In addition, this metal is resistant to the effects of various external factors, and therefore ovens made of this material are usually not painted.

Despite the above, it is recommended to treat cast iron with protective coatings. Polyurethane and acrylic paints are suitable for this material. Cast iron, unlike iron, “suffers” from a violation of paint processing technology.

Ranking of the best brands and manufacturers

There are more than 10 high quality heat resistant paints on the market suitable for finishing metal ovens. Popular foods are:

• Tikkurila Termal Silikonimaali. The paint, which has a semi-gloss shade, is suitable for finishing metal that heats up to +450 degrees. Finnish paint materials protect the surface from corrosion and destruction. After application, the composition requires additional heat treatment.
• Certa KO-85. Colorless varnish is heat resistant up to +900 degrees, contact with aggressive substances and water. LKM is suitable for application at sub-zero temperatures. This varnish is characterized by increased consumption, since the composition must be applied in at least 3 layers.
• "Celsite-600". Enamel is used to color ferrous metals heated up to +600 degrees. LKM is suitable for products exposed to petrochemicals, salts and moisture.
• Cheer. This silicone paint is used for finishing ovens heated up to +650 degrees. The material is characterized by high covering power and the ability to withstand negative temperatures.
• Decorix. This enamel comes in the form of an aerosol that makes it easy to paint hard-to-reach areas. But the material is used for finishing surfaces heated to +350 degrees.
• Veslee. Another heat-resistant spray that can withstand heating up to +400 degrees. The film that forms after drying is resistant to precipitation and contact with aggressive substances.
• Elcon. Optimal silicone paint for ovens that heat up to +1000 degrees. The material is available in black or white. When a pigment is added to the original composition, the heat resistance of the latter deteriorates.
• Bosnia. Aerosols for finishing ovens heated up to +650 degrees are produced under this brand.
• Dali. This composition is mainly used for facade work, but is also suitable for finishing ovens. LKM is produced only in black.

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For finishing metal furnaces, you can also use universal heat-resistant silverware, which can withstand heating up to +600 degrees. This enamel is moisture resistant and dries quickly at room temperature. The silver should be applied in a maximum of 3 coats. This composition is demanding on the quality of the preparation of the work plan.

Baking and oven dyeing technology

Regardless of the type of paint chosen, the metal surface must be prepared for the application of the material. The life of the coating and the oven depends on the care taken at this stage.

Surface cleaning and preparation

Before painting, the oven must:

• Eliminates traces of grease. To do this, the surface is treated with a solvent (white spirit or solvent), then with a soapy solution.
• Removes traces of rust. A 5% sulfuric acid solution helps remove this plaque. When working with this composition, gloves should be put on your hands, and your mouth should be covered with a respirator.It is recommended to apply sulfuric acid with a brush. After this treatment, the surface must be cleaned with soapy water (50 grams of soap per liter of water).
• Remove dirt. In this case, a soap solution is also used.

At the end of the procedure, sand the surface with sandpaper.

This helps to increase the adhesion level of the paint material. Sandpaper remnants and metal shavings should also be removed before finishing.

Coloring: methods and sequence

The order of coloring is determined taking into account the chosen type of paint. If it is indicated on the packaging with the material that the surface must be pre-primed, then this procedure must be carried out before applying the composition. You should also take into account the minimum temperature at which painting on metal is allowed.

Heat-resistant paint materials are applied by brush or spray. To increase the resistance of the material to external influences, the surface should be painted in 2-3 layers, each time waiting 1-2 hours (the duration is determined by the manufacturer) until the composition dries.

If spray enamel is used, shake the can several times before painting and bring it to the surface from a distance of 20-30 centimeters.

When finishing the potbellied stove, such a method as bluing is used. In this case, the outer walls of the stove should be heated to a temperature of +150 degrees. Then you need to spray a solution of sodium hydroxide on the surface. At the end of the process, the oven must be left to rest for two days. After complete drying, the surface turns black or brown.

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Also, at home, a mixture of water glass and aluminum powder is used to paint the oven. This composition can also be applied with a brush. It is recommended to treat the oven with such a mixture externally, since after the first heating, acrid smoke is emitted. This compound protects the metal for five years.

Final stage and corrosion protection

Most manufacturers produce heat-resistant paints, which, after drying, acquire the desired properties. However, in some cases, after the completion of the work, the material requires additional heat treatment. In such circumstances, the outer walls of the oven should be reheated to the temperature indicated on the packaging.

After finishing painting, it is not recommended to apply additional materials to the painting materials. High-quality paint will protect the metal from corrosion and other negative factors.

Coating drying time and durability

Both indicators depend on the type of paint used. On average, it takes 3-4 days to dry the painting materials. During this time, the material acquires the required strength. Premature heating of the oven will weaken the thermal shock resistance of the coating.

Safety precautions when working with painting materials

It is recommended to carry out painting work on stoves outdoors or in a room with active ventilation, at a temperature and humidity permitted by the manufacturer. When using such materials, wear personal protective equipment and keep away from open flames. It is also recommended to start the oven for the first time after painting in a well-ventilated room or outdoors.

Recommendations from the masters

Before starting work, it is recommended to disassemble and paint the removable elements separately from the oven on both sides, observing the rules described above. If the structure is close to a wall, the back should be sprayed. In this case, the walls and floor of the room should be covered with paper.

It is recommended to paint the stoves installed in a bath or sauna, it is recommended that the paint materials can withstand temperatures of +600 degrees and high humidity. Rarely used structures can be treated with less expensive materials.