Painting furnace made of metal
It should be understood that there are several reasons when you can resort to painting a brick stove. So you can approach this issue from the aesthetic side, from the practical and for the sake of safety. As for aesthetics, a stove in a house is needed not only to heat the house and be comfortable in it, but also to maintain the interior and create special coziness. On the practical side, after the fireplace is painted, the heat output increases and the stove surface is leveled.
Note! From a safety point of view, thanks to staining, it is possible to prevent the appearance of microcracks on the brick and, as a result, prevent the fire of the home. There are several options for painting the structure.
You can do this:
There are several options for painting a structure. You can do this:
- enamel;
- oil paint;
- drying oil;
- heat-resistant varnish.
Heat-resistant oil paint for ovens is the best solution, since there is a large selection of colors, the paint can withstand temperatures of 600 degrees Celsius, it is guaranteed to protect the brick from oxidation, has increased resistance and durability. In addition, it is easy to apply and does not need any additional priming on the outside. However, there are disadvantages in the form of unpleasant odor, toxicity and long drying times.
Drying oil is a material that is not able to change the color of the brick, but only slightly make it darker. As for the positive qualities, this coating is reliable and safe. The only drawbacks are the price.
Heat-resistant varnish is a coating that can improve the technical characteristics of a brick surface.
Note! The peculiarity in its use is that it can be diluted with gouache to acquire the desired color with a shade. Cast iron is a sufficiently strong metal that is favorably able to withstand prolonged exposure to high temperatures.
According to some sources, it is possible not to resort to painting the metal, but it is better to do it. An excellent option for a cast iron stove is the use of water-based acrylic or polyurethane paint, which has already proven itself excellent. In addition, the cast iron alloy will be able to withstand even disturbances during painting in a more favorable way.
Cast iron is a sufficiently strong metal that is favorably able to withstand prolonged exposure to high temperatures. According to some sources, it is possible not to resort to painting the metal, but it is better to do it. An excellent option for a cast iron stove is the use of water-based acrylic or polyurethane paint, which has already proven itself excellent. In addition, the cast iron alloy will be able to withstand even disturbances during painting more favorably.
The painting process itself looks like this. First, the surface is pre-cleaned with a metal brush. Next, the oxidations are sanded with sulfuric acid, and the mixture is washed off with a soap solution. Then the metal is degreased with a solvent and covered with paint. This is the whole dyeing technology. In this case, the painting of the metal oven should be uniform. All seamed corners should be reworked as much as possible.
Note! If you do not want to drip onto the surrounding elements of the oven, you must use cellophane with masking tape
Brick stoves
You can paint a brick stove using enamel, oil paint, drying oil and heat-resistant varnish.
In the first case, the structure will be protected from moisture, will have good strength and durability. In the second case, the plastered and painted surface will be able to withstand high temperatures, and in the latter cases it will be able to impart strength to the brick.
Before painting begins, you need to clean off all crumbling material from the oven. For this, a construction brush with metal bristles (a brush) is useful, or a narrow spatula will do. If the material is well removed, then it may be more expedient to remove it down to the brick luggage, in which case any paint for fireplaces and stoves can be chosen.
The next step is to remove all debris and clean the surface of dust. Further, with their own hands or with the help of a professional, they repair cracks, holes and seams. Now in specialized stores, ready-made mixtures are presented that are suitable for working with brick ovens.
Surface preparation for processing
Preparing the surface for painting
Before painting a metal stove, it is important to properly prepare the surface. In some cases, prior preparation is not required, while in others it is necessary to follow the rules indicated on the label .. Typically, preparation includes:
Typically, preparation includes:
- Cleaning the surface from traces of oils and grease, old coatings, water-soluble salts and others.
- Remove rust down to gray metal using emery, grinder or drill attachment, or sandblasting machine. Sometimes the surface is allowed to be coated with rust converters, but this should be indicated on the paint package. Upon completion of the treatment, the surface must be washed and dried. It is necessary to remove rust completely, up to the elimination of the smallest specks.
- Degrease the surface with xylene or solvent immediately before painting. Further staining should be carried out no later than 6 hours after exposure to air or 24 hours indoors.
In each case, the required number of paint layers and their direction are purely individual. If more than one layer is required, then they are applied in different directions so that the paint lies more evenly.
The temperature and drying conditions of the paint, as well as the gap between coats, are always indicated on the label. Compliance with the manufacturer's recommendations will allow you to get a coating that will last the specified period.
Application feature
There are no requirements for applying heat-resistant enamel as such. Painting is done with a roller, spray or brush. If you purchased enamel in a spray can, then you do not need tools.
Before applying the paint, you must first prepare the surface, that is, clean off the rust, degrease and remove dirt. We advise you to mix the paint well before work, after which the mixture should be kept for several minutes with the task of removing air bubbles. We advise you to apply the enamel in several layers. Apply the next layer after the previous one has already dried.
We paint the brazier with our own hands
We paint the brazier with heat-resistant paint
When I got acquainted with heat-resistant paints better, I realized that painting my barbecue should take place taking into account some features. Therefore, let's look at the main properties of the barbecue and then we will understand how to paint the barbecue.
To begin with, we know that this object must not only withstand high temperatures, but also be protected from atmospheric influences. Water getting on the metal, which is also subject to temperature changes, accelerates the corrosion process. That is why you need to paint the braziers on time. So before buying the necessary composition, I found out that it should have the following properties:
- Heat-resistant paint must also be heat-resistant. Choose mixtures that can withstand 600-800 degrees Celsius
- The composition of the material must use components that prevent rusting
- Do not emit harmful and toxic substances
Prepare the surface before painting - a drill with a nozzle helped me, but if you don't have one, then get sandpaper. The brazier will have to be cleaned very carefully, because the surface should be as ready for painting as possible.
- Do not forget that you need to paint the brazier only from the outside and in no case inside. This is due to the fact that no paint can withstand the temperature while burning wood or coal inside the barbecue
- After removing all corrosion from the object, I sanded it with sandpaper and then washed it with water and powder. When all the preparation processes are completed, you need to let the brazier dry completely.
- For my metal, I used liquid paint, but if you use aerosol, then paint in calm weather and a temperature of 20 and above
- It is better to apply the liquid mixture in two layers, before applying the second, let the first dry well - do not forget that the first 20 minutes after applying the coating, the object of painting must be protected from dust. Otherwise, you will not like the result of staining.
The cost of heat-resistant paints and varnishes is largely determined by their composition, which affects the thermal stability of the paint. Recently, paint and varnish materials based on organosilicon have become increasingly popular. They are used not only for painting fireplaces and stoves, but also for the treatment of heating devices, heat exchange equipment, barbecues and much more.
Aluminum powder, which can withstand temperatures up to 600˚C, also helps to significantly improve the heat resistance of the paintwork. Such a composition is excellent for coloring barbecues, not only protecting it from corrosive processes, but also giving it an excellent appearance.
Heat-resistant paintwork materials not only make it possible to make the appearance of the structure more attractive, but also significantly extend its service life. This is achieved due to the fact that the paint and varnish coating evenly distributes the temperature over the entire painted surface, as a result of which overheating of the stove or barbecue is excluded.
Currently, there are quite a few proven heat-resistant compounds that you can make with your own hands and paint a metal stove or barbecue. In principle, this is one option - add aluminum powder to the liquid glass and mix well, the result is a heat-resistant silver paint.
Before applying heat-resistant paint, as well as any other, the surface must be pre-prepared. Clean from debris, remove rust and old coating with sandpaper, degrease and only after these procedures can you start painting. Heat-resistant paint can be applied with a paint brush, roller or spray gun.
Heat resistant paints can be applied over a wide temperature range from 40˚C to -15˚C, but it is necessary that the air humidity is within the normal range. It is better to apply a heat-resistant paint and varnish coating in several layers. The second layer should be applied only after the first one is completely dry.
Selection and use rules
In order to choose the right paint, it is necessary to determine the maximum temperature of the surface on which it will be applied. You also need to calculate the area and make a choice between a spray in a can and a liquid consistency in a can. But there are still some rules to be aware of.
Specific nuances in terminology
Many sellers in their advertising campaigns are very frivolous about the terminology adopted for formulations that can be applied to surfaces with high temperatures. There is no normatively established gradation according to the correspondence of the name of the composition and its maximum permissible heating temperature.
However, three well-established terms are commonly used:
- high temperature;
- heat resistant;
- heat resistant.
High-temperature paints for metal include compositions that can withstand prolonged heating of the surface up to 2000C. They are used to treat radiators and heating pipes, brick stoves and fireplaces. In addition, they are suitable for automotive parts such as engine, muffler and exhaust system.
Water jacket of a metal furnace. Outside, it does not heat up above the temperature of the coolant, so high-temperature paint can be used to treat its surface
Heat-resistant compounds are used for surfaces with temperatures up to 6500C.
Such paints are used for the following metal objects:
- sides and bottom of ovens;
- braziers;
- combustion products exhaust pipes;
- the place where the pipes of the water circuit are connected to the furnace or boiler.
Heat-resistant paints and enamels often contain pigments that give them color, so they can be used to create original interior design solutions.
Heat-resistant paint is intended for coating surfaces that are heated to temperatures over 6500C. First of all, these are hobs and furnaces of stoves, as well as grates of wood-burning stoves and fireplaces.
Some types of thermal paints have an additional feature - fire resistance. This means that the painted surface can be in direct contact with the flame. From household metal objects, this is true for the fireplace grate and the inside of the barbecue.
Thermal hardening theory and practice
Heat-resistant paint is inherently heat-resistant enamel. A thermal quenching procedure must be followed to create an impermeable barrier. In the process of heating the surface with the composition applied to it, the layers polymerize, after which air access to the painted metal stops.
Sometimes a colorless varnish is applied to protect metal products. This type of coating also requires thermal hardening.
It is after thermal hardening that neither oxygen, which causes the rusting process, nor moisture can penetrate under the enamel. Prior to that, the paint has only a decorative and, partially, protective function against physical impact.
Moreover, after the creation of an impermeable layer, the evaporation of substances contained in the paint into the air of the room stops. Therefore, ideally, it is necessary to wait for the specified period of complete drying, which is indicated on the label or in the instructions, and then immediately carry out the thermal hardening procedure.
Usually the temperature at which the enamel cures is 200-2500C. This leads to one common mistake, which is often made by people who have leftovers after painting the stove.
It is impossible to apply a heat-resistant compound, which requires heat hardening, on radiators and heating pipes, since the degree of their heating is insufficient to complete the process. For mildly hot objects, use ordinary high temperature paint.
Theoretically, the thermal hardening process should take place at a constant temperature for 30-60 minutes. However, in practice, it is unrealistic to achieve such “laboratory” conditions.
Therefore, wood stoves, barbecues and fireplaces are not flooded at full capacity and gradually increase their heating. Typically, the test run takes 1.5-2 hours. Another option is heating with an industrial hair dryer.
Packaging
Heat-resistant paints can be purchased in various packaging - these can be cans or cans. From spray cans, paint is simply sprayed over the surface, and from a can, paint is used with brushes, rollers or special spray guns.
The volume of the balloon is usually 500 ml. Banks are produced in 400 g, 800 g, 2.5 kg and 5 kg. There are also large 5-15 kg buckets and barrels.
Which way to apply thermal paint is everyone's personal choice.Someone will find it more convenient to use a brush or roller, others will stop at a spray can. In the latter case, the material consumption will be significantly lower, and the paint lays down smoother and more evenly.
When can I heat up after painting?
After painting, the structure cannot be operated until the paint or varnish is completely dry. How long it takes depends on the paint and varnish used, the number of layers applied.
The timing for the different materials is as follows:
- the drying time of heat-resistant paint depends on the components included in it, often it takes only an hour;
- the first layer of heat-resistant varnish dries up in an hour, only 2-3 applications are needed, the subsequent ones dry longer;
- drying of organosilicon enamels usually takes up to 2 hours;
- natural linseed oil dries out within 24 hours if the temperature is kept above 20 ° C.
Regardless of the paint and varnish used, it should dry completely after a day. It is better to wait longer so that everything is completely dry. Impatience can turn out to be a complete failure, then all the work will have to be done again.
Even an inexperienced user can cope with painting a heating structure, if you follow the algorithm of work. Coloring can be done with different materials, one of the main conditions is the heat resistance of the selected product. You can make it on your own, which will reduce costs.
Where to start painting
Having chosen a heat-resistant paint, do not rush to apply it to a brick or metal surface. If the packaging indicates preparatory steps, be sure to follow the recommendations. Basically, before painting, the following actions are required:
- cleaning the structure from fat, salt, old coating;
- removing rust with sandpaper or sandblasting;
- drying and thorough washing;
- degreasing with a solvent and painting in 6-7 hours (but no later than in a day).
Cleaning circle for grinder
Palette of colors
If it is necessary to apply a second coat, wait until the previous coat is completely dry and only then proceed with the surface treatment. Thermal paint should be of high quality: look at the date of manufacture, composition, name, address of the manufacturer. If some information is missing, look for another product, otherwise you risk causing harm to your health.
Popular brands of paints
Heat-resistant enamel Elcon.
To paint a brick fireplace or stove in the house, you can use the varnish of the Russian brand Elcon. With its help, it is easy to give the stone a matte or semi-glossy look. The effect is determined by the number of layers applied. The varnish is available in aerosol cans. One is enough to process 2 m² of surface. The coating dries in 3 hours, it takes 3 days for the varnish to fully cure if the room temperature is maintained.
Elcon heat-resistant paint is suitable for machine tinting. The black composition has the highest heat resistance. It can withstand temperatures up to +1000 ° C. Pigmentation of the paint and varnish material reduces its heat resistance characteristics. After tinting, the paints can be used at temperatures up to +600 ° C. They can be used to cover ceramic surfaces, metal boilers and fireplace grates. Paint consumption is determined by the number of layers applied and the structure of the surface to be treated.
The Cetra KO-85 varnish of the Russian manufacturer "Spectrum" is produced in cans. The 0.8 liter capacity is enough to cover 5 m² of surface in one layer. The varnish can withstand temperatures of +250 ° C. Since the composition is made on the basis of solvents and synthetic resins, it has a pungent odor that disappears after heat hardening of the painted surface. When working with this with varnish, it is necessary to ensure good ventilation of the room.
How to paint a brick bath stove
Paints and varnishes intended for painting stoves and fireplaces must withstand temperatures of at least 300-400˚C. Most containers with heat-resistant formulations indicate that they are able to withstand temperatures of 600-750˚C, which, in principle, is sufficient for a conventional home oven.
The simplest solution is to purchase a special heat-resistant paint for stoves and barbecues at any hardware store. However, such a specific paint and varnish material is often sold at an inflated price, since marketers believe that if a person has the funds to create and maintain a stove or fireplace, then he is able to buy an expensive heat-resistant composition.
But even wealthy people want to save money and therefore can resort to alternative means - some of the most common paints are able to withstand high temperatures. For example, you can paint a stove with plain enamel or oil paint, but if there is drying oil in the paint and varnish material, the coating will darken over time.
Painting the outer surface of a brick sauna stove will not require increased heat resistance. The surface does not often get hotter than 100 ° C. Unless the temperatures are slightly higher near the furnace casting. Therefore, temperature resistance up to 300 ° C is sufficient.
- For a brick oven, heat-resistant anticorrosive enamel ELCON can be used, which can withstand temperatures up to 700 degrees. The same manufacturer has a heat-resistant varnish KO85. It can withstand temperatures up to 250 degrees.
- Ecoterra. It is a heat-resistant brick oven paint with a maximum heating of 400 ° C and can be applied to ceramic and concrete substrates. The surface is matt, the color is red-brown.
- Thermal paint KO8101 can be used for both brick and metal ovens.
- Bosnia Oven Aerosol can be applied to glass and ceramics.
- Heat-resistant paint for ovens CERTA can also be applied to the brick.
There are classic options for refining a brick oven. If the brick is ugly, then the stove is plastered, then whitewashed with chalk or lime mortar. In order for the surface to be smoother, it is putty after plastering, and so that clothes or hands do not get dirty, a water emulsion is used instead of traditional chalk and lime.
If you need to paint the metal elements of a brick oven, then purchase compositions from those that are suitable for metal ovens with a heat resistance of more than 700 degrees. First, the parts must be cleaned from rust, dirt and old paint to shiny metal. Then cover the surface near the door (as a rule, paint it) with paper and can be painted.
Painting the outer surface of a brick sauna stove does not require high heat resistance. The surface rarely heats up above 70-80 ° C. Unless, near the furnace casting, the temperatures can be higher. Therefore, heat resistance up to 200 ° C is enough in excess.
- Ecoterra. It is a heat-resistant brick oven paint with the highest heating temperature up to 400 ° C, applied to concrete, ceramic substrates. Color - red-brown, matt surface.
- The anticorrosive heat-resistant enamel ELCON can be used for a brick oven withstands heating up to 700 ° C. The same manufacturer has a heat-resistant varnish KO-85. It can withstand temperatures up to 250 ° C. For decorative processing of the brick surface - what you need.
- Can be applied to bricks and CERTA oven paint.
- Aerosol Bosny (Bosnia) can be applied to ceramics (brick belongs to this group of materials) and even glass.
- Thermal paint KO-8101 can be used for both metal and brick ovens.
There are traditional ways to beautify a brick kiln.If the brick is not beautiful, the stove is plastered, then whitewashed with lime or chalk mortar. To make the surface smoother, it can be putty after plastering, and so that hands or clothes do not get dirty, use a water emulsion instead of traditional lime and chalk.
If you paint metal parts of a brick oven, the rest of the surface must be protected.
If it is necessary to paint the metal parts of the furnace, choose a composition from those that are suitable for metal furnaces with a temperature of 800 degrees and above. First, the parts must be cleaned from old paint, dirt and rust to clean metal. Then the surface around the door (they are painted most often) is covered with paper (fasten with masking tape) and can be painted.
Why We Don't Use Regular Paints
Paints for barbecue and other heating surfaces must have certain properties that ordinary coloring compositions simply do not have. That is why heat-resistant paint is necessary for painting stoves, radiators, barbecues and other surfaces.
Barbecue paint
Painting with ordinary paints is not allowed for a number of reasons, which we will consider next:
- The color of the coloring pigment will necessarily change due to the increase in temperature. Any coating may simply turn yellow or blacken
- The coating will crack, it is also possible to completely or partially peel off
- The bonding base will be lost, and the paint layer will be charred and destroyed thoroughly
The heat-resistant mixture has a different composition, which differs due to the area of application of the material. For example, heat-resistant paint is suitable for a brick oven - its natural composition does not harm human health and thanks to it, the coating conducts heat and does not collapse. It can be used for self-coloring in a private home.