Updated: 03/06/2021 13:13:28
Expert: Andrey Nikolaevich Kuznetsov
*Review of the best according to the editors of expertology.ru. About the selection criteria. This material is subjective in nature, does not constitute advertising and does not serve as a purchase guide. Before purchasing, consultation with a specialist is required.
Metal is a durable building material that can be formed into various designs. It is used as a frame for houses, door frames, furniture and stairs. In the courtyard of a private house you can often find iron gates, a fence, or a garage. The only drawback of the material is oxidation upon contact with moisture, as a result of which carbon steel rusts. We present to you a rating of the best metal paints that have high adhesion to solid materials and form a durable protective film. The products were selected by analyzing the characteristics of our experts and taking into account the opinions of customers in reviews.
Specifications
Water-based acrylic paints are used for exterior and interior finishing works. These mixtures have good adhesive properties to any surface. They are safe for human health and the environment. Primers and enamels are easily accessible at their cost, which is why they are widely used for interiors.
Acrylic paints for metal are also used for exterior work. The coatings differ:
- resistance to ultraviolet radiation;
- water resistance;
- excellent vapor permeability;
- great wear resistance;
- resistance to any precipitation.
Acrylic material can be used to process any surface - wood, concrete, brick. After the water evaporates from the applied enamel, it is covered with a smooth and dense film that does not fade or crack. The paints are ideal for use at home, as they do not have a strong odor and will not harm the skin, even if they get on it. Enamels are more suitable for external work.
You can paint metal not only with brushes, but also with other tools. When using a roller, the quality of the treated surface is significantly improved, and spraying the mixture with a spray gun is the most economical option, since the product is covered with a very thin film. This allows you to apply paint to objects with a larger area.
There are special mixtures for working in rooms with high humidity. Some paints are diluted with antiseptics and fungicides. Anti-vandal compounds are used for super-durable, smooth surfaces. After drying, the products can be frequently treated with any cleaning solutions.
Rules for applying paint to a metal roof
The application technology of all types does not differ much from each other. Much will depend on what type of roof is being painted: a newly built one or an old one with corroded areas.
Painting a new roof
First of all, the roofing metal material is cleaned. Remove debris and wash the surface with water. The paint is applied only to a dry roof, so it must dry after washing.
- If a roof lined with sheets of black iron is painted, it is pre-treated with special primers, which additionally protect the metal from the negative effects of moisture. The primer is applied in two layers, each of which must dry well. Depending on the air temperature, this takes from 2 to 6 hours. Therefore, this stage may drag on for a day.
- Galvanized sheets can be painted without additional treatment.
Primer of roofing materialSource bg.aviarydecor.com
Painting an old roof
The main task of the work manufacturer is to thoroughly prepare the roof surfaces for painting.
- The roof is inspected to identify rusty areas.
- Determine the degree of corrosion. If the degree is severe, then repair work is carried out.
- Rusty areas are cleaned with an iron brush manually or using a grinder.
- The roof is cleared of debris and dirt.
- If necessary, wash with water and dry well.
- Regardless of what metal the roof was assembled from, corrosive areas are treated with primers. Often the entire roof plane is treated. The number of layers is two, each should dry well.
- A day later, the paint coating is applied. Ideally, two layers.
Painting a metal roof goes through several stages - from cleaning off corrosion to applying a protective layer. Source roofroof.net
How to apply paint
In principle, paint is applied to roofing material using the same tools as on any other surface. These are brushes, a paint roller and a spray bottle. It should be noted that painting with a brush takes a long time, and the material consumption is increased. The roller is the golden mean: the speed is higher, the layer is applied thinner. A spray bottle is the ideal option: the highest application speed, plus minimal consumption.
But it should be noted that, for example, rubber paint in its pure form cannot be applied with a spray gun. Alternatively, it can be diluted, for which it is better to use a thinner recommended by the manufacturer of paint and varnish products. In addition, the size of the applied layer has its own requirements.
Painting the roof with a spray gunSource verh-stroi.ruAdvantages
Acrylic paints began to be used recently, but quickly gained popularity due to their qualities. The mixtures have good durability. Acrylic paints for metal remain on the surface without corrosion for eight years. The coating retains its protective properties for years without requiring renewal.
Solar ultraviolet radiation and oxygen hitting the top layer of conventional paints cause it to harden. As a result, it becomes increasingly thin, very fragile and covered with cracks. This does not happen with acrylic paints.
The white coating does not turn yellow and does not lose its gloss. This became possible thanks to the polymer emulsion, which acts as a binder, does not react to oxygen, and cannot be oxidized. Despite the fact that the final durable film on the painted surface takes a long time to form, the mixture dries quickly and after that it is not afraid of any bad weather.
The problem with many coatings is metal corrosion. The metal quickly begins to react to moisture and condensation. As a result, a loose red coating appears on it, which is called rust. Acrylic paint for metal for exterior use contains an anti-corrosion substance. It reacts with rust and forms an inert composition.
The film that forms after complete drying has excellent elasticity. As a result, a metal surface painted with acrylic enamel can withstand any temperature changes. In this case, compression and stretching of the metal occurs, which, due to the elasticity of the paint film, has absolutely no effect on it.
In addition to the listed advantages, acrylic paint for metal does not contain fire hazards or toxic substances. Therefore, the coating is ideal for painting gas and oil storage facilities and gas stations.
Exterior metal paints can withstand temperatures up to 120 degrees. Specialized compounds are created from silicone resins. Epoxy-bitumen coatings are also used. Compositions made from silicone resins can withstand temperatures up to 600 degrees, bitumen - up to 400.
Expert advice
The roof is coated with many paints and varnishes at sub-zero temperatures. If the warm season is missed for painting, then it is better to postpone the work until there is stable frost. It is not recommended to paint the roof at 0°C-8°C. At this temperature, condensation forms on it.
The best time to work is a windless autumn morning. In the evening, all preparatory procedures are carried out. The second coat of paint is applied in the evening of the same autumn day. By this time the first layer will be dry. In addition, there will be time to notice errors in work. The last to be painted is the ridge and drain pipes.
Read further:
Varieties and overview of rust paints
Features of choosing paint for metal products
Pros and cons of silicate paints for facades
How and what is the best way to paint slate
What is rubber paint and its areas of application
Flaws
Acrylic coating has some disadvantages. But they are easy to deal with. Initially, the mixture dries very quickly, but the final formation of a layer of acrylic paint on metal and the formation of a durable film takes place within 30 days. During this period, the enamel dries completely and hardens “tightly”. For a month after application, while the paint is still pliable, it must be protected from contamination and any deformation.
The second point that can be attributed to disadvantages is decorative properties. Many paints have a brighter, richer color scheme. Acrylic mixtures have more muted tones. But for painting roofs and fences this is not so important, so color properties can only be classified as disadvantages only conditionally.
The cost of acrylic coating is much more expensive than conventional compositions. But this can only be classified as a disadvantage only conditionally, since the mixtures have great durability. But acrylic compositions do not tolerate severe frosts so well.
Inexpensive paint for galvanizing
Enamel based on modified acrylic resins provides complete protection of the roof, drainpipes, fences and any other elements made of galvanized and ferrous metal from corrosion. Additives included in the product formulation made it possible to reduce the drying time of the coating to a minimum. Under standard conditions, the 3rd degree of drying is achieved within 30 minutes after applying the first layer!
After formation, the polymer layer reliably isolates the substrate from the effects of the industrial atmosphere, moisture and gases. Thanks to the wide application range, you can work with the material not only in summer, but also in winter (at an air temperature of at least -20ºC). The composition is one-component, which means that you do not have to pre-mix before application.
Accelerated climatic tests of enamel conducted by NPO Lakokraspokrytie LLC showed that with proper application and surface preparation in an industrial atmosphere, the two-layer system retains its protective qualities for at least 10 years.
Coating the roof with paint
Painting work is carried out with a roller or wide brush. Large, flat areas are painted first. The second tool is used for painting small parts. If you have skills in working with a spray gun, then you can use it. It is used to paint seam roofs. The sprayer is installed for convenience on an extension rod.
A ladder made of boards is laid along the roof. It is needed to move.
Most often the coating is two or three layers. The applied layer should be thin. Streaks appear on the thick one. Before each coating, wait until the previous layer of paint has dried. It is indicated by the KM manufacturer on the can.
