Facade paints for external plaster work: types and features of application
Stucco is a fairly common option for decorating exterior surfaces of buildings. But to create a truly unique exterior is not enough simple application of the solution. Therefore, after its drying for further finishing works, the facade paint is used for plastering.
What should be the paint for outdoor work?
The paint for exterior plaster work should have the following characteristics in order to stay on the surface longer:
- Resistant to mechanical influences, such as abrasion.
- Biological safety: fungi, mold and pathogenic microorganisms should not develop on finished coatings.
- The composition of the material should be a special component that protects the coating from exposure to sunlight.
- Facade paints on the plaster must be resistant to the effects of various chemically active substances.
- In such paints add components to increase fire safety.
- The material is elastic, so that the coating does not crack when shrinking the building.
Facade paints should be very strong, resistant to external factors
On a note! Some formulations have an antistatic effect. They repel dust, which is very important for buildings that are located near large roads.
Types of facade paints
The modern construction market offers the buyer a huge number of facade paints for outdoor plaster work. They are made on the basis of various materials and with the addition of various components, on which their performance depends.
Based on water glass
This facade paint for plasterwork for outdoor works also has another name - silicate. It is made on the basis of silicate glue, in which mineral pigments and fillers are added. The life of such coatings reaches 20 years. This indicator was achieved due to the high level of vapor permeability, therefore water does not accumulate under the coating. As a result, the plaster for painting does not absorb a lot of moisture and will not fall off the wall. The main disadvantage of this material is the susceptibility to mechanical stresses. In addition, the paint is not elastic, so it can crack very quickly after drying.
Silicate paint based on liquid glass
Based on lime
Such paints for the facade on plaster are made on the basis of slaked lime. The main advantage of this material is low cost, but it is important to understand that saving on buying a coloring compound, in the future will have to spend annually to maintain the facade in a normal way. The paint gets dirty and washed off with water, so after spring rains it will be necessary to paint the house anew. It should also be said that hydrated lime differs bactericidal properties, as well as a good level of vapor permeability. The color scheme is usually limited to light pastel tones. You can additionally purchase colors and add bright colors, but such material will quickly fade in the sun.
Limestone exterior paint
Based on cement
In some cases, cement based paints are used to paint the plaster. The basis of such a composition is portland cement white, but you can add color to get the desired color. Unlike lime materials, such a paint is not washed away by rain, but it can develop pathogenic organisms. The cost of cement materials is also low, but they have not gained popularity among domestic buyers.
Composition for the painting of a facade based on cement
Based on acrylic resins
At the moment, this finishing material is considered the most common, because it has a good price-quality ratio. In addition, the paint has a good indicator of mechanical strength. But there is a significant drawback - acrylic does not let steam pass, as a result of which moisture will accumulate under the coating and can lead to its rapid deterioration. This material is divided into two types depending on the solvent used: water based and based on organic substances. The latter are used for painting facades most often.
Acrylic exterior paint
Based on silicone
Such materials are considered the best for finishing plaster facades. They lose a little to acrylic compositions in terms of elasticity, mechanical stability and cost, so they were not widely used. The plaster layer after treatment does not absorb moisture, but at the same time it has a high vapor permeability index. Silicone paint is characterized by low consumption, resistance to high and low temperatures, as well as their differences. The finished coating repels dust and is not exposed to ultraviolet rays.
Painting composition for external work on the basis of silicone
Other types of paints
There are several other types of facade paints, which are rare on the market. For example, perchlorovinyl paint. The main advantage of this material is low cost. In addition, the composition is produced in a large range of colors and can be applied to the surface even at negative temperatures. Paint protects the walls from weathering, corrosion, the appearance of bacteria, fungi and mold. But the lifetime of the coatings is only 4 years, and the presence of easily flammable components make the material unsafe.
For external finishing works, structural compositions are sometimes used. In fact, these paints are more like decorative plaster mixes. The advantages are plasticity and elasticity, so that it is convenient to work with the material. The disadvantage is a small amount of color solutions, high cost, short service life of finished surfaces. In some cases latex is added to such formulations in order to increase the level of surface protection.
Preparatory work before staining
The first step is to prepare the surface. To do this, you need to evaluate its state. If the plaster is old, frayed, has gone stained and looks unsatisfactory, you will have to completely remove it and apply a new one. If the plaster layer looks normal, then you need to tap the entire surface with a hammer to find weaknesses. Fragments of plaster are removed, and the formed holes are closed with putty. At the end of the wall wash and allow to dry. Then apply the primer of deep penetration into two layers and also leave to dry.
Stages of surface preparation for staining
Now you need to calculate the required amount of paint. First you need to calculate the area of each outer wall and add the resulting numbers. Then multiply the result by the average material consumption rate - first for the first layer, then for the second layer. The fact is that most facade paints are applied in several layers, each of which requires a different amount of material. This is done to improve the quality of the finished coating. If you try to save and apply only one layer, then after drying will look through the stain of a different color.
At the very end, you need to prepare everything you need, the following tools and materials will be needed for the event:
- Stepladders or scaffolding.
- Roller or paint brush.
- Drill with a nozzle-mixer.
- Measuring capacity.
- Capacity for paint.
- Protective clothing, goggles and gloves.
Tools and materials required for painting the facade
Instructions for applying paint to plaster
First set the forest, after which you should mix the composition. This can be done with a construction mixer, a drill with a suitable nozzle or a simple wooden strip. Then you need to measure the exact amount of color and pour it into the paint, then mix it again.
You should know! Adding color is the most crucial step. It is important to observe the accuracy of this process, so that the color of different surface fragments does not differ.
If you add the color yourself, you should accurately calculate the required volume, otherwise the colors colored by different lots of lots may differ
The paint should be poured into a special container, dip a roller or brush in it, then wring out the tool and apply the composition to the surface with vertical movements, treating the coating from top to bottom.
After drying the first layer, proceed to the second. Everything must be done exactly the same, but the movements must be horizontal. As a result, the smears will intersect, which will provide a more dense uniform coating. It is recommended to work quickly, do not tighten the stain for a long time. The best time for the procedure is a dry and warm period, for example, late spring.
Painting the facade is one of the simplest kinds of finishing works, which even an inexperienced home master will cope with. Thus, you can save a lot on the services of painters, as well as create an exterior with your own hands. To get a high-quality result, it is enough to follow the above instructions and recommendations of manufacturers.