Selection and correct use of a spray gun for whitewashing the ceiling

Technical description of instruments

Paints and varnishes are applied in three ways: with a brush, roller and spraying. The third method requires a tool that is capable of somehow providing pressure to supply liquid from the container to the working base. Such devices are called airbrushes, spray guns or spray guns.

The whitewash sprayer is selected taking into account ease of use to solve specific problems. This could be painting a small room or high-quality ceiling finishing at a particular height. To understand which sprayer is the optimal solution, you need to understand the technical features of the devices.

Manual device

A hand-held spray gun for whitewashing is the simplest tool in terms of design. This is an inexpensive, universal type device. Its use extends both to compositions with chalk or lime as a base, and to ready-made water-soluble paints.

An example of a hand-held spray gun for whitewashing Source c-technika.ru

In the private sector, the tool is used to process trees. The operating principle of such a device is based on the operation of a plunger pump. Here, the suction of the solution occurs while the volume of the empty space inside the housing under the piston increases. As it decreases, the compressible composition is released under pressure within 0.5 Atm.

A manual spray gun for whitewashing consists of the following elements:

• plunger pump;
• two hoses - suction with filter and pressure;
• a fishing rod for adjusting the direction of the outgoing stream of paint;
• valve - a shut-off mechanism for opening and stopping the flow of liquid through the painting rod;
• nozzle - a tip on a fishing rod for spraying whitewash.

An example of a nozzle for the body Source ozone.ru
The movement of the working composition begins with a suction hose, which is immersed in a tank with paint. Here, solid particles and lumps, which have a larger fraction than the holes in the nozzle, are cut off. When the rod of the piston part lowers, the valve closes at the inlet and opens to the outlet for the fluid to pass into the discharge hose and the painting rod. Due to pressure, the flow passes through the nozzle and turns into a dust-like mass. This is how whitewash is applied to the ceiling in an even, thin layer. The working distance between the nozzle and the base is limited to 1.5 meters, but there are models with the ability to adjust the length of the painting rod.

Extension rod for sprayer Source dino-power.ru

Experts point out several disadvantages regarding the manual lime sprayer. Here it is more convenient to work together to ensure the coloring process without long breaks. But this is not a guarantee that the liquid will flow to the nozzle under constant pressure. There is also low pressure, which causes the droplets outside the nozzle to be of different sizes and relatively large. Therefore, the coating formed is of low quality.

See also: Catalog of companies that specialize in finishing materials and related work

Electrical appliance

This type of spray gun for whitewashing ceilings belongs to the group of semi-professional equipment. Here, to work, you need to connect the tool to an electrical network. A less common alternative is a rechargeable battery. They are necessary to start the motor, which is responsible for moving the paint from the source to the nozzle.

According to the principle of operation, electric models are divided into 2 types:

• Airless.

Such spray guns are acceptable for whitewashing with lime and painting with water-soluble paints. The pressure in the device is provided by a piston mechanism. The advantages include the absence of fog formations outside the nozzle; the pump can be built into the device or located at a distance from it.

Among the disadvantages, users note the formation of a relatively thick coating, a high probability of clogging the nozzle nozzle with a thick composition based on chalk or lime.

Sample of an airless electrical device Source anticorsib.ru

• Air.

Here, the transformation of the jet into dispersed dust occurs due to the air flow. The process of balanced operation is ensured by a built-in turbine or solenoid motor.

The advantages of such devices are the ability to select power, mobility and coverage with good quality of a thin layer. But to work with the equipment, due to the formation of fog, it is necessary to provide protective equipment for the respiratory organs. Some users speak negatively about the noisy operation of the engine.

Compared to mechanical analogues, electrical devices have several advantages. There is no need to perform physical actions to pump liquid, since the engine is responsible for this. The quality of the coating is higher due to the uniform supply and distribution of liquid. But there is one drawback - the torch covers a smaller area, which affects the reduction in finishing speed for an identical unit of time.

Pneumatic device

A professional whitewash sprayer includes a compressor, which is responsible for supplying compressed air to the sprayer under a pressure of an average of 4.-5 atm.

Sample of a pneumatic spray gun Source dsauto.su

DIY spray gun holder

Important! A stand for an air-type paint sprayer involves securing a paint tank in it. It is not possible to install an airless spray gun in such a holder due to the lack of a paint container in the device.

A do-it-yourself spray gun holder is most often made of thick wire or a metal rod approximately 6 mm thick.

1. Measure the diameter of the paint sprayer container and make several rings from the rod. The diameter of the rings should be slightly smaller than the diameter of the tank. You can bend the rod around a pipe of a suitable diameter using a vice and a hammer.

2. Next, these rings must be welded to a straight piece of rod.
3. Self-tapping screws can be welded to the other end of the straight rod, with the help of which the holder will be screwed into the board, as shown in the following photos.

4. The board with holders is attached to the wall. It is necessary to make markings on the wall for self-tapping screws, drill holes in it and insert plastic dowels into them.
5. All that remains is to screw the holders into the dowels through the board, and the stand for paint sprayers is ready.

Advice! The length of the board is selected taking into account the number of spray guns that need holders.

Preparation of working solution

For whitewashing with equipment, it is necessary to properly prepare the composition from slaked lime or construction chalk. The first option is otherwise called fluff or lime dough. Here, per 1 kg of the base component there are 3 liters of water. In this state, the mass is not white, so for 10 liters of the prepared solution, add 1 teaspoon of paint blue. In the same proportions, table salt helps to increase the strength of the coating. And 2 tablespoons of drying oil can improve the adhesive properties of paint. Before using the solution, it is recommended to strain it through cheesecloth to prevent frequent clogging of the filter element or nozzle.

If lump lime is initially used, it must be pre-slaked. To do this, the raw materials are mixed with water at the rate of 1 kg per 1 liter. The mass is brought to a homogeneous state and acquires a white tint. The chemical process is accompanied by the release of a large amount of heat, which is justified by heating the mixture to +100 degrees Celsius. The paste is infused for 7-14 days, after which you can mix paint to whitewash the ceiling.

Lump quicklime Source pogos.ru

A chalk solution for whitewashing from a spray bottle is prepared in a ratio of 1 to 5 (meaning kg of powder or liter of dough). To increase the degree of whiteness, 1 teaspoon of paint blue is also added here. Craftsmen supplement the composition with laundry soap (50 grams) and wood glue (30 grams) to increase adhesion and strength.

Device from a car camera

If you plan to paint a small area, for example, the body of a car, then you can build a spray gun from an old car camera. It will serve as a receiver, that is, a vessel for accumulating air.

This paint spraying device, in addition to the car camera, is assembled from:

• car pump;
• pressure gauge;
• a nipple from another old camera;
• two fittings.

The car camera taken to create a spray gun must be intact and free of holes. This is important because it will be under a lot of air pressure.

When making a spray gun from a car camera, you need to complete the following points:

1. We check if there are any punctures in the chamber by inflating it with a pump. If air escapes from the chamber in some place, the rubber part is repaired; You can use an old camera
2. We make a small hole in the receiver without punctures. It will become a place for attaching an additional nipple, from which a compressed air stream will emerge;
3. We insert an additional fitting into the formed hole, carefully fixing it with adhesive. After this, the fitting can be connected to a household sprayer;
4. We try to unscrew the nipple. If the air flies out slowly, then the work was done flawlessly;
5. We screw the nipple to the original nipple on the camera. It is assigned the role of a valve that lowers the pressure if it is too high;
6. Determine the air pressure in the chamber. An intermittent (excessive) behavior can be indicated by a pressure gauge.

Video about the work of a homemade airbrush

Ceiling painting process

To obtain a high-quality result from whitewashing with lime using a sprayer, you need to familiarize yourself with a number of recommendations from the masters in advance. You should start with the correct selection of the nozzle. Manufacturers often include a set of replacement nozzles with the tool. For liquid whitewashing, it is better to use a nozzle with a hole size of up to 1 mm. This way it will be possible to achieve good atomization, avoid the formation of smudges and reduce the consumption of the solution used.

The second point is the position of the spray gun. The angle relative to the working platform must be maintained straight. This way the composition will be applied evenly. And the distance from the nozzle to the wall or ceiling is selected by test painting.

Whitewashing the ceiling with a spray gun with a separate compressor Source texwagner.ru

Paint is applied to the base in layers. First, the whitewash sprayer is passed along the surface at medium speed to create a thin primer coat. The covering layer will stick to it better.

After completing the staining procedure, the instrument must be washed. To do this, the intake hose is lowered into a container with clean water. Then drying is done by blowing air through the instrument.

Benefits of using a spray bottle

When starting to make a spray gun with your own hands, let’s note the main advantages of using an airbrush over manual painting. These include:

• better and more uniform coloring;
• the appearance of foreign objects on the surface, for example, lint or bristles, is excluded;
• acceleration of the dyeing process.

Directions in which you can use a self-made sprayer:

• for painting furniture products, wooden structures;
• for painting cars and other metal surfaces;
• for whitewashing ceilings and walls with lime.

Briefly about the main thing

A spray gun (airbrush, spray gun) is a special device for dispersing and spraying paint compositions onto a particular surface.

The principle of operation of the equipment is to take a solution from a source, supply it through a pressure hose and spray it through a nozzle onto the base to be painted.

Technically, the equipment is represented by three main groups: manual, electric and pneumatic (the list corresponds to the quality of the coating being formed).

The whitewash solution is mixed with water in proportions of 3 to 1 with slaked lime or chalk.

The composition must be applied in at least 2 layers, the first of which is conditionally a primer.

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Vacuum cleaner device

Using a vacuum cleaner as the main element of the spray gun greatly simplifies the work process. This spray gun can be used to paint large areas.

In addition to the vacuum cleaner hose, to make this device you will need:

• glass or plastic containers;

It is important that the neck of the selected bottle is at least 3 cm in diameter.

• tube made of copper or aluminum (required thickness - 4 mm, length 20 cm);
• plug;
• brass tube;
• piece of metal (steel).

Paint is sprayed using a hose

Armed with everything you need, you can begin the process of creating a spray gun:

1. You need to bend a tube made of aluminum or copper and attach it to the vacuum cleaner hose;
2. It is necessary to machine a tip from the pipe, which will act as a nozzle. To do this, you can take a brass tube;
3. Then you need to take the socket from the plug connector and insert a thin tube (2 mm) into it;
4. It is necessary to create a bracket with a recess for this socket. Steel is suitable for this purpose;
5. All that remains is to clean one edge of the tube and bring it together with the cone.

All manufactured parts must be connected to the bottle. The tube required to suck in the air flow must be fixed in the correct position. This structural element must be placed in the same axis with the nozzle. Then the tube should be glued to the socket by tightening the nut.

Video about using a vacuum cleaner to paint walls

How to work?

Before performing painting work, you will definitely need to prepare the surface, yourself, the surrounding area and the tool.

The surface requiring painting must be leveled, primed, sanded if necessary and cleaned of dirt and grease. And it should be remembered that each subsequent layer of paint is applied only when the previous one has dried , otherwise you can create unnecessary stains and smudges on the surface.

Given the greater protection from possible limescale burns when working with the solution, the dye jet sprays the finest dust around itself. These fine particles can get on exposed skin and mucous membranes, thereby causing irritation. Contamination of nearby furniture, floors and interior items is also possible. Therefore, before work, take care of your safety by wearing gloves, a respiratory mask and completely covering your skin with clothing .

The floor should be covered with a special construction film; if possible, furniture and things should be removed from the work area or also covered with a protective layer of film.

Among other things, you should check the performance of the spray gun and, if necessary, adjust everything. Also make sure that it is clean and that its internal parts are not contaminated with dried paint residue.

When preparing the coloring composition, it should be carefully filtered to remove lumps and large particles of the solution to avoid clogging the spray nozzles and disrupting its operation. This can be done using gauze or a special strainer.

It is also important to adjust the size of the nozzle for a more uniform application of the coloring solution.

Having finished with the preparation, you can start working.

After filling the spray bottle with a paint solution, you should check the spray on an unnecessary surface - it could be an old board, scraps of plastic or cardboard. The check is done in order to prevent the creation of an air lock in the nozzle , which can produce unsightly paint spitting.

It can also help determine how far away from the surface you should be holding the tool for best results.

During operation, monitor the pressure and maintain the required level to prevent the paint from being applied too thickly.

The spray gun should be held at right angles to the surface to be painted , the solution should be applied evenly and smoothly, without stopping in one place, spraying the paint in overlapping movements layer by layer.

If you take a break during the painting process, especially when applying quick-drying paint compositions, it is best to place the end of the paint gun in a container of water or solvent (depending on the type of paint used), which will prevent the solution remaining in the nozzle from drying out.

Upon completion of work, the spray gun should be disassembled and thoroughly cleaned for further storage and subsequent use.

The most important and basic rule for caring for spray guns is their mandatory washing and cleaning after each use. All types of spray guns have their own structural features; there is no universal solution. Besides the fact that cleaning is simply necessary . Because of this, your mechanical tree tool will serve you for many hours of construction work.

After all surfaces have been painted, whitened and left to dry, the remaining paint should be drained from a special tank. The pump with hoses and nozzles should be thoroughly washed . In some cases, following the instructions, to remove thickened paint, you can use special flagella to clean clogged tubes or hoses.

If this is neglected, then paint residues may dry out in the sprayer channels, and then it will be very difficult to wash out particles of dried material. Also, with further use in work, this dried paint can peel off and get on the surface to be painted, thereby making work difficult.

After cleaning, you can run ordinary water through the spray gun, thereby checking the quality of the spray.

Afterwards, you can simply blow it with air and dry it thoroughly; if there are parts that require lubrication with special compounds, then they need to be lubricated . After everything, the instrument is assembled and sent for storage.

Spray gun hoses should be stored in coils. Hanging them is highly discouraged to avoid cracks at the bends.

About once every six months you can check the device more thoroughly. Inspect it visually for damage or malfunctions. Check and, if necessary, replace gaskets and valves. Observe its functioning and operation.

With the correct selection of the device you need, its proper configuration and operation, timely cleaning and proper storage, such a wonderful thing as a spray gun will serve you for a long time and will delight you with excellent work results.

For a review of the SO-20V manual spray gun, see the following video.