Acrylic paint is the most popular among facade paint. And this is not surprising: it fits perfectly on any surface: concrete, wood, plastered, fiber cement. It can be used to paint previously painted walls without removing the old but still adhering finishing layer.
Acrylic paint for wood
Colorants based on acrylics are water-soluble. This is their undoubted advantage, since working with such paints is not only easy, but also safe.
In their composition there is not a single substance that can harm the respiratory organs or skin.
Painting wood with acrylic paint
When applied correctly, these paints do not form smudges or sags. The painted surface is smooth and uniform. One of the best properties of acrylic paints is its excellent hiding power. However, when working with difficult surfaces, it is recommended to apply two coats.
This will provide greater color saturation and durability. All manufacturers of acrylic paints guarantee that with proper preparation and painting of surfaces, their products will last at least 10-15 years.
Painted walls of a wooden house
When choosing a paint color, it should be borne in mind that lighter colors are capable of reflecting heat and ultraviolet light. Therefore, such formulations are optimal for homes in regions with a warm climate. Light-colored walls will suffer less from overheating, and the finishing layer on them will last longer.
The opposite situation with the recommendations for the northern regions. Here it is better to choose colors of saturated and brighter colors.
Bright green acrylic paint
The composition of acrylic paints is very simple. It includes:
Characteristics of acrylic based paints
|Material / Characteristics||Acrylic paint|
|Mass fraction of volatile matter,%, not more than||52-57|
|Consumption||115-120 g / m2|
|Drying time||1-2 hours|
|Working temperature||+ 5 ° С - + 30 ° С|
|Density|| ~ 1. |
4 kg / dm³
|Frost resistance||More than 10 freeze-thaw cycles| Building paint
Preparing walls for paint application is an extremely important step that cannot be ignored. First of all, they carefully examine the surface of the facade. If the house has been previously painted, take a trowel with a metal blade and check how firmly the old finishing layer holds.
Do not apply fresh paint to this surface.
If paint is easily removed, remove it.Depending on the thickness of the coating, choose the tool for the job. If the layer is thin and peels off the walls easily, a spatula and metal bristle brush will suffice.
Sharpen with a spatula to remove old paint more easily
Removing paint with a spatula
A thick layer, which in places firmly adheres to the walls, will require the use of angle grinders (grinders) with a special attachment: a cord brush for rough wood processing.
She (the brush) is able to remove not only the old finishing layer, but also to level the wooden surface. Sandpaper disks will not help in this work.
Cord brush for angle grinders, bowl-shaped
If old paint can be easily removed, you can use 80-120 GRIT grinding discs. It is recommended to take into account that when the finishing layer is removed, a significant amount of dust will be generated, containing small fragments of the old coating. Therefore, it is necessary to protect the respiratory system with a respirator or cloth bandage.
Grinding is a very hard and unpleasant job , since the sandpaper is constantly clogged with paint
Preparation of the surface for painting
Before proceeding with mechanical cleaning of the facade, it is necessary to remove all nails, if any. If it is not possible to remove them, they hammer them with a hammer. If the nail heads are rusty, unsightly stains will appear on the new finishing coat over time. Therefore, metal is treated with red mercury or special anti-corrosion washes. The latter are preferable, since they, unlike mercury, are not poisonous.
For rusty nails, drainpipes, etc., use red mercury
If the walls are made of logs, machining excluded. In this case, other techniques are used to prepare the facade for painting. First of all, you need to check the density of the filling of the space between the logs. It is usually filled with tow, moss or hemp.
These materials need to be compacted where required. After that, dirt and dust are removed from the surface of the logs with a rag or broom.
The process of preparing a facade for painting includes a priming stage. In order not to make mistakes in this matter, you need to remember one rule: external wooden walls cannot be coated with a water-based primer. Only on oil.
As a rule, all high-quality primers are antiseptics at the same time. Before starting work, you need to carefully read the instructions on the package. The conditions under which the primer can be applied with this agent and the manufacturer's recommendations for application will become known.
Primer Tikkurila Valtti Akvabase (Valtti Aquabase)
Valtti Akvabase (Valtti Aquabase) and BIOFA tree primers are considered the best ..
. These oil-based compounds can be used on any wood: freshly planed, pressure treated, heat treated, old. Personal protective equipment must be worn when working with Valtti Akvabase.
Special wood preservative primer
For small applications, a natural or artificial bristled paintbrush can be used to apply the primer. This tool is especially useful when processing log facades.
If the walls are even (plank or timber), you can apply a primer with a roller. This is not difficult to do.
Step 1. Pour enough primer into a paint tray or any other suitable container so that 1/3 of the roller volume can be immersed in it.
Stir the primer
Pour the primer into the tray
Lower the roller into the solution and roll it 2-3 times over the relief horizontal part of the paint bath. This removes excess primer, and it will not drain from the wall during application.
A roller with a foam rubber coat is an excellent tool for applying primer
Step 3. Moisten a section of the wall, rolling a roller over it. Each next strip should go 5-7 cm to the previous one.
Apply the primer evenly
Step 4. Re-immerse the roller in the primer and wring it out. Further, the work is continued according to the given algorithm until the entire area of the facade has been processed.
Wood with fresh primer
Sand the primed surface after drying
Remember that there should be as little time as possible between priming and painting. Not all primers are light and UV resistant.
Therefore, they need to be covered with a layer of paint in a timely manner.
Impregnation for wood
The mechanical method of painting wooden facades involves the use of special tools. But regardless of the chosen method of finishing work, several rules must be observed during their implementation.
Painting the facade mechanically is convenient in all respects.
Spraying paint allows it to penetrate into the smallest cracks and pores of the wood. This method is most beneficial when painting log walls. With the help of a spray gun, a finishing layer will cover all places that are hard to reach even for brushes.
Two types of tools are used to apply paint: air and soulless spray guns. They are otherwise called "sprayers".
Pneumatic airbrushes, spray guns, texture guns
Principle spray paint tools
|Tool||Tool types||Operating principle|
Air spray gun
|Pneumatic and electrical. The second ones are of three types: with a lower and upper tank, with a pump for supplying paint.||Paint spraying is carried out under the influence of an air stream, which is supplied by a pump or pressure (up to 8 atm) created in the tank.|
Airless spray gun
|Membrane, piston, hydraulic piston.|| Paint is supplied by compressing it without using air.
The spray gun is equipped with an elliptical nozzle with a small cross section. Due to the difference between the pressure inside and outside the apparatus, the effect of paint spraying occurs at the moment it leaves the nozzle.
The most economical airless spray method. But devices of this type are more expensive, therefore, they are mainly used when painting large areas. However, this method also has its drawbacks.
One of them is that a significant part of small droplets hangs in the air surrounding the workplace, and gradually settles. Therefore, it is necessary to use personal protective equipment. Another drawback of the airless method is that it requires the highest quality protection of all nearby objects and facade elements: windows, doors, platbands, etc.
The process of painting with a spray gun
Electric air-type spray guns are most convenient for painting the facade of a private house. These tools have their advantages and disadvantages.
Among the downsides is the formation of rather large drops that fall to the ground without reaching the wall. The advantage is that this application method does not generate a dust cloud with fine paint particles.
Diagram of an electric spray gun with a hose
Manual electric air-type spray guns are the easiest to use. They represent a pistol grip, at one end of which a hollow rod with a nozzle is fixed, and at the other - a reservoir for paint. A hose from a pump equipped with a control unit and an electric motor is connected to this container.
These tools are inexpensive and easy to use.During operation, they do not emit sounds characteristic of large machines and do not vibrate much. With this spray gun, you can paint the facade at least twice as fast as with a roller or brush.
Performance characteristics that are important when choosing a spray gun
The tank capacity of such tools does not exceed 1.5 liters.
Household models apply paint at a rate of 0.5-0.7 l / min. Household airless spray guns work a little faster: up to 1 l / min. The most popular brands: Wagner, Bosch, BORT, STURM, Spets.
Spray gun Bosch
Recommended nozzle section:
More powerful tools - painting stations. They are distinguished by significantly higher productivity than manual counterparts. The stations are equipped with powerful electric motors and have a wider range of adjustments.
Spray gun device diagram
Step 1. At this stage of the work, all elements of the facade not intended for painting are protected.
They are covered with plastic wrap, which is fixed with staples and a construction stapler.
Prepare the surface to be painted
Step 2. Dilute the acrylic paint with water. Each household spray gun is equipped with a special device (watering can) to determine the viscosity of the composition. How to determine it?
For acrylic paints, the average flow time should be 26-28 sec. For primers - 24-25 sec. In order to achieve this indicator, they begin to dilute the composition with water in a ratio of 1:10 (1 part water and 10 parts paint).
Check the viscosity. If diluted insufficiently, add another 10% water. Thus, they find the optimal proportions and achieve the required composition density.
Step 3. Pour the diluted paint into the spray gun container.
Step 4. Adjust the ink supply using a special regulator, which is equipped with any machine of this type. On the body of the spray gun or on the regulator, gradations should be applied: maximum, average, minimum. If you plan to paint a large area in one go, set the maximum paint feed rate. If you want to paint a small section of the facade, set the minimum or medium.
Testing the spray gun before work
Filling the spray gun tank
Step 5. Plug in the power cord of the machine.
Step 6. Bring the spray gun to the facade at a distance of 40-50 cm and press the button for turning on the tool (located on the handle).
Make a test stain and observe whether there are any strong stains. If they are, reduce the flow rate using the regulator.
Step 8. Apply paint to the facade so that the surface is evenly painted.
When the paint in the reservoir runs out, refill it and continue working.
Spray gun application
Spray gun use
Using a spray gun
Painting the facade with a spray gun
When painting log walls, special attention is paid to the places of the recesses. It is not recommended to fill the spray gun container with more than 800 ml. Otherwise, the device will be difficult to hold. It should be borne in mind that any electric spray gun vibrates.
Therefore, you need to take breaks at work in order to give your hands a chance to rest. But in any case, using a well-tuned sprayer, you can paint the facade with acrylic paint as quickly as possible.
Painted wall of a wooden house
Surface painted with acrylic paint
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