How to choose a drill electric screwdriver for home
If you need to tighten the screw or unscrew the bolt, you will probably face the problem. How to choose a good electric screwdriver? We examined the features of network and battery tools, analyzing their advantages and disadvantages. In addition, we learned the opinions of the foremen, finding out where it is better to use a drill electrical screwdriver, and when a regular tool is suitable.
Drill. Electric screwdriver 1: 0
One of the most common misconceptions: an electric screwdriver and a drill-electrical screwdriver-the same thing. But this is not so. Drle-electrical screwdriver and ordinary electric screwdriver has differences in the functionality.
Functions of ordinary electric screwdriver
Functions of a drill-electrical screwdriver
Does not drill holes in the materials
Drilling holes in the materials
As you can see, the drill-electrical screwdriver has more functions. Over, both tools have about the same price.
What electric screwdriver or drill-electrical screwdriver is better to choose? The answer to this question depends on the type of work that you will do. For work at home, it is better to use an amateur (household) tool. This means that such a gadget will not hit your budget much, but it will not solve all your problems. For example, with it, it is easy to change the lock or collect furniture. The average rotation speed of amateur electric screwdriver is 350-500 revolutions per minute. Such indicators are not enough to work at the construction site.
Expert’s opinion Sergei Porotarev, master, g. Nizhny Novgorod Work experience at a construction site: 20 years.
When thinking about how to choose an electric screwdriver, remember that there are tools for professional construction, but there are for home use. What electric screwdriver to choose for homework? If you need it only to drill one hole per month, it is better to buy an inexpensive amateur home tool. At the construction site it will be ineffective, more powerful tools are needed there. And if you choose an electric screwdriver for work, earning money on construction, it is more advisable to pick up and purchase a professional electric screwdriver, or a drill-electrical screwdriver.
Professional electric screwdriver for builders is more powerful than household. Its rotation speed is from 1,500 revolutions per minute. Such tools can be used to drill solid materials, for example, wood, metal or ceramics. They are able to withstand heavy loads.
Expert opinion Andrei Savin, Prostrab, g. Voronezh Work experience at a construction site: 12 years.
In working with the tool, it is important to control the momentum so that the torque does not destroy the fasteners. To install siding and subsystems, it is better to use a regular electric screwdriver with speed adjustment. But on the roof, in my opinion, you need to work more promptly and rationally. Therefore, it is more advisable to choose something more resourceful so that the self-tapping screw can quickly and efficiently scroll through. On the roof I use a drill electrical screwdriver. Which company of an electric screwdriver to choose? I have an instrument of a popular brand for the letter “E”. Everything suits me in him. When you are used to working with the same tool for years, your hands feel it. You already know at what point you need to click on the button, and when release. But this is only my opinion.
Battery or network?
How to choose a good electric screwdriver or drill-electrical screwdriver by type of power? They are divided into:
The former eat from the network, the latter. From the battery, and others can work as well as this and this.
Drill-electrical screwdriver of the brand with the letter “H” with a battery voltage 16 volts. Photo taken from the site: https: // www.Youtube.COM/ channel My Gadget. Link to the video: https: // www.Youtube.COM/Watch?V = jsumchftys0
Network tools are charged from sockets. Compared to battery, they have higher power and low weight. But network tools have a significant drawback. Dependence on the outlet. If it is far away, the wires are confused under the feet of workers. For some builders, this is not a hindrance.
Expert opinion Andrei Savin, Prostrab, g. Voronezh
Choosing between the battery and the network for working on the roof, I prefer a network tool. Even if he jumps out of his hands, he will not fly anywhere and remains hanging on the wire. And the drill-electrical screwdriver on batteries in such a situation will fly down and may be damaged. It is for this reason, in my opinion, a wireless drill-electrical screwdriver is inconvenient to use on the roof. The choice between a network tool and a battery depends on the habit of a particular builder. In order to drill holes in the metal, it is better to choose a drill electrical screwdriver, where the speed speed is adjustable and it is possible to change the nozzles. When working with furniture, you can use a regular electric screwdriver. The same tool with speed adjustment and rattle is suitable when working with drywall and concrete. I emphasize once again that the availability of speed and ratchet adjustment is important here, because if you make speeds of revolutions a little more, you can praise and spoil the material.
Battery screwdrivers and drills-shuruvriva operate on batteries, so they do not depend on the presence or absence of electricity at the facility. They are used at any time of the year when working at altitude (not all experts are afraid of the fall of the tool) and on the street. The disadvantages of the tools on the battery include dependence on charging, so experienced builders for such cases take a spare battery. Amateur electric screwdriver working from the battery, in power loses to its network analogue. But professional screwdrivers on batteries, as a rule, differ in their power for the better.
Drill-electrical screwdriver of the brand on the letter “D” with a battery voltage 18 volts.Photo taken from the site: https: // www.Youtube.Com/channel My Gadget Link to the video: https: // www.Youtube.COM/Watch?V = jsumchftys0
Expert’s opinion Sergei Porotarev, master, g. Nizhny Novgorod
Choose the shape and size of the tool
Let’s start with a simple one: we will select the correct shape and determine how large the battery drill is an electrical screwdriver to be comfortable and not to lose a very precious battery capacity. Here the size does not just matter. It is very important. If the drill is too heavy, you will curse everything and everyone after 1-2 hours of screwing screws into drywall on the ceiling. If you buy a screwdriver-electrical screwdriver, you will not be able to drive a screw into a tree more than 3 cm.
The most popular electric screwdriver when screwing drywall sheets weighs from 1.8 to 2.4 kg. But if you are going to perform not only finishing work, but also drill wood, profiles and metal sheets, then it will be more convenient to take a 2.5-3 kg tool in weight. If the tool is often used in the role of a drill, and you plan to work with drill more than 8 mm in diameter, then it will be better to give preference to models with a weight of 2.5 kg and a large battery.
Now a little about ergonomics. The form is also very important. Now we will tell you how to choose a battery drill with an electrical screwdriver for the house, so that then it would not be rubbed and it was convenient to do everything. First, pay attention to the angle between the handle and the body. If the angle is less than 90 degrees. There will be problems. After an hour of work, the thumb will be very much wiped. Also keep in mind that too raised the cartridge can become a problem. Such tools are taken for work on the ceiling, but it will be inconvenient to twist on the walls and on the floor, with constant pressure, the hands will be very tired.
Now about the buttons. The reverse should turn on and turn off the hand in which you hold the tool when working, because with the other hand you hold building materials or yourself. Switching with two hands is not safe. If the reverse or speed button is not in the access zone of the index or thumb. This will become a problem soon.
Small drill-electrical screwdriver drill-electrical screwdriver of medium sizes Drill-electrical screwdriver of large sizes
Which drill an electric screwdriver to choose and what to pay attention to
There are several signs by which it is possible and should be selected.
What to choose and how among drums (DS)? Key parameters: appearance, functionality and the presence of certain modes, the possibility of setting and controls.
The best job is when it is convenient and comfortable. Therefore, the ergonomics of the DSH is one of the first factors in the selection. Already when taken in hand, it will become clear whether it is easy to hold a tool with a hand and whether it is possible to reach the required buttons with one hand.
The shape should be streamlined if possible, the color is bright for quick search and easy determination of damage to the body and handle. The design of the pistol type can be both classic and with a slightly shifted hand (the angular arrangement of the cartridge is purely individual and not universal). Electric screwdriver battery is the most ergonomic.
The handle can be tilted or at right angles, a battery is placed under it. The balance is visible only with the established change of nozzle. The retention is reinforced by the surface of the handle. The rubberized or rough surface will facilitate the effort to create friction.
The main feature of this type of DS in the engine without brushes (Beskollector type). The brushes that are out of order, which serve to switch electric current, are replaced by an electronic control unit.
Brightless engine has the following list of pluses and minuses.
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- Simple adjustment of rotation and change in a wide range;
- Lack of brushes and the need for their regular replacement, prolonged functioning;
- Efficiency and high efficiency;
- Lack of sparking and functioning in conditions of dust and in mixtures of explosive gases;
- Reduced dimensions and mass;
When food from the battery, the service life of a bullying DS will be higher. With all the advantages, limited budget often makes such models bypass.
A cartridge of electric screwdriver
There are several types of cartridge, each of which is well suited for a certain specificity.
- Fast.Minded (BZP). A classic structure (spindle, sleeve, tsangi), the key is not required: the most wear.Resistant and reliable, for drills with a round shank you need an effort, more ordinary;
- Self-loading or SDS patron-even a muscular force is not needed for delaying: the tool will cope with the work with a quick change of nozzles by means of design from balls holding the shank for deepening in it;
- Hexagonal-perfectly for bits as a nozzle with an appropriate shank: successful for screwdrivers, mini-fires, drill;
- Bit patron-a cartridge for bit: it is needed to remove (turning away) fasteners, most convenient at home.
The cartridge captures the working body, the form and purpose of which can be different. Up to such a solution as a pump for a drill or even a jigsaw.
Rotation speed adjustment
The speed of rotation of the working tool is performed manually or automatically.
Manual setting is performed mechanically. On the case, there must be control organs for this. A button or switch, after working with which the speed of rotation changes. This is relevant for DS with a capacity of 18 in.
Automatic adjustment is carried out through the work of the built.In processor. The signal received from the regulator or toggle switch enters the processor. He, in turn, sets the engine operation and the required rotation speed.
Adjustment is also found by pressing the start button. The bottom line is that the stronger to burn the button, the faster the number of revolutions will be. At the same time, both the strength and the depth of the button pushing are played. The power supplied to the spindle and the working tool will grow directly in proportion to them.
The shock mode is not the main one for DS. Therefore, without the need to overpay for additional unnecessary equipment to nothing. An unstressed apparatus is enough for twisting. Determine the conditions of use and targeted materials.
The essence of the shock regime is that the usual rotation is supplemented by reciprocating movements in the direction of the rotation axis. A special mechanism from high.Strength materials provides an advance. Creating a high number of shocks per unit of time. Thanks to this, it becomes possible not only to tighten the metizes, but also to create holes in solid materials. Stone and concrete.
The benefits of shock models of DSH is compact, which allows you to refuse in some cases a separate shock drill, replacing one electric screwdriver. The mode does not affect the diameter of the cartridge.
One of the most popular additional functions is the ability to stop the engine. The value when choosing a tool with the brake function is that when twisting screws or screws, the moment often occurs when the further movement of the methysis is strictly prohibited, and in the inevitably there is inertia during the operation of the engine. As a result, while the engine after the Stop command still makes a couple of revolutions of the tool, the self.Tapping screw manages to delve into a couple of millimeters.
In addition to ensuring the safety of surfaces, this function is useful when withstanding the tightening force. The risk of overeating falls significantly, the combined materials do not crack due to the excess deepening.
The difference from the work of a conventional mechanism is an instant engine stop after releasing the start button.
What to pay attention to when choosing a drummer drill?
Adjustment of torque
This function allows you to adjust the torque to specific tasks. For example, to screw the screws into dense wood, you need a high torque, and to attach drywall. Low so as not to damage the material.
Note that the adjustment of the torque is in absolutely all drummer ditches, since with the help of the cuff, in fact, the drilling mode is exhibited. The difference in models can only be in the number of provisions. If you have to work with many different density of materials, you should take with a large number of modes, which will make it possible to configure the device as accurately as possible. If you need a device, bought for banal home repairs, you can not pay attention to the quantity.
In drums-shutters, the shock mode can have two varieties: drilling with a blow and twisting with a blow. When twisting, the impulse blow increases strength, and the self.Tapping screw enters faster and deeper, even if the material is very dense. In drilling mode, the blow increases the force of pressing the drill, so the drilling of metal and wood occurs faster. The demonstrative operation of the shock mode can be seen in the powerful model Dewalt DCD996P2, which is capable of drilling holes with a diameter of 15 mm in metal, and in wood up to 55 mm.
True, the shock mode is not needed in all works. For example, it is extremely rare to assemble furniture, so the carpets will not be needed. But for drilling interior walls it will really come in handy.
In some devices there is a mechanism that brakes the engine immediately after turning off the power button. Thanks to this, the cartridge with the nozzle stops almost instantly and the device does not have to keep it on weight for a long time. It is especially important that heavy models weighing 2 kg have this function, since with prolonged work, such “expectations” of the cartridge stop can greatly tire your hand.
The safety coupling is a mechanism that protects the engine from damage with a sharp increase in the load, for example, as a result of jaming the drill in the workpiece. With such a critical load, the safety coupling disconnects the shaft of the cartridge from the engine, thereby protecting it from breakdown.
The safety coupling is quite rare, and even then only in battery models. For example, it is in Bosch GSR 18V-60, and reusable use. Please note that in some models there is a safety coupling, but in the characteristics of the goods it is indicated as “electronic engine protection”. If the reliability of the device and the durability of the engine are important to you, take a model with a safety coupling.
It is also called the Bingle.Injective Engine. The main feature of such an engine is a higher efficiency in comparison with the brush, that is, lower energy consumption with the same useful power. If energy consumption is not so important for network models, because there is always power, then for batteries this is a significant indicator. Devices with a bronnial engine consume less energy, but give out excellent power. A bright representative of the brilliant devices is a powerful German drill-electrical screwdriver AEG BSB 18CBL, which can drill not only metal and wood, but also concrete.
Another advantage of brilliant engines is the lack of sparking, which is useful when working in fire hazardous rooms. Crimeless engines are equipped with expensive models, so if your budget is limited, it is better to take a closer look at models with a collector engine.
Tool nutrition system
Both the screwdrivers and the electroder were presented today by models with different types of energy supply. Traditionally, the tool of both categories works on a conventional outlet. These are light and compact devices, but they are dependent on access to the power source. Over, compactness and lightweight are fundamentally important for an unstressed network drill, since the degree of pressure from the user requires a small.
The presence of a battery block eliminates the need to connect the device to the outlet, but increases the mass and dimensions of the tool. As a rule, loaded batteries on lithium-ion or nickel-cadmium elements are used as source. On average, batteries and screwdrivers can work autonomously for 45-60 minutes. For the convenience of operation, many manufacturers provide in the set of a spare power supply, which can be used while charging the main battery.
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Currently, batteries have managed to gain consumer trust. They are an excellent alternative to a screwdriver or hand drill. Different manufacturers offer to purchase screwdrivers that differ in characteristics. To buy a suitable model, you need to study their properties and consumer reviews.
What is the difference between a drill and an electric screwdriver?
Some are sure that electric screwdriver is the same as an electric drill, but more compact. However, it is not. The main purpose of electric screwdriver is to twist and twist screws. The drill is used to obtain round holes. Thus, these are two different tools, albeit similar. The differences of one from the other are as follows.
- If the permissible load exceeds during screwing, the self.Tapping screw begins to scroll through. The drill does not have this.
- The speed of rotation of the cartridge in an electric drill is much higher.
- The electric screwdriver does not have an inertial moment, so it instantly stops in contrast to the drill. Her cartridge continues to rotate, slowing down gradually.
- With the same power and voltage, the electric screwdriver is characterized by greater force.
Can there be a drill and an electric screwdriver in one tool?
If desired, you can purchase a tool that combines the qualities of an electric screwdriver and a drill at the same time. Drinks-shuruvrets are produced by different manufacturers, for example, Makita, Metabo, Bosch. In this case, the features of the inherent both drills and screwdrivers should be taken into account.
This type of batteries, which is designated as NICD, has the largest sizes. But the price is low, and work is uninterrupted even at minus temperatures. The only thing that may not play in hand is the presence of a memory effect. To avoid this, the battery should only be charged after final discharge. If this is not done, then the tool will remember incomplete exercises, and in the future it will not give all the energy.
This species is marked like nimh. These drives are of low weight and high level of environmental friendliness. They are also able to work for a long time without additional recharging. But the tool has a disadvantage. It consists in the impossibility of functioning in frosts. Even if there are two degrees on the street with a minus sign, the battery is discharged. Therefore, it must be stored only in a heated room.
Lithium-ion drives or Li-Ion began to be produced in 1991 by Sony Corporation. They have no memory effect, so it is possible to recharge at any charge level. Weight. Approximately 40% less than other models, charging is held for a long time. Such batteries are often installed on professional tools of the tool, especially when it is combined with a drill.
Parameters of selection of batteries
This parameter determines the duration of the functioning of an electrical screwdriver without additional recharging. Tools with a capacity of 1.3 to 2 a/h are domestic, and above 2 a/h. Professional models.
If it is necessary to perform quick work, an important indicator is the charge speed. Unprofessional model charges from 2 to 12 hours. If the tool is expensive, then it is possible to do in 1 hour, and sometimes in 30 minutes. Typically, such screwdrivers have lithium drives and impulse charging.
Depending on the model, the voltage varies from 3 to 36 volts. The torque of the instrument at 14.4V and 12V is equal. Therefore, buying a tool of greater power may seem inappropriate. However, the battery of 14.4 B works longer until the charging starts to fall.
The best manufacturers of screwdrivers (rating)
Before purchasing the tool, it is advisable to determine the choice of the manufacturer. There are many such companies today. But among them the most popular, which include the following.
- Bosch releases tools of household and professional class, each of which copes with the tasks perfectly.
- Metabo is known for the production of universal and reliable models. The brand has a high.Speed cartridge, as well as an impeccable motor cooling system.
- Makita makes construction tools, constantly using the emerging technological innovations and improving the existing models.
- AEG produces universal devices that can make different holes and connect parts with screws and nuts.
- Dewalt does not differ in a large line of models. But each of them is high.Quality and highly effective.
- Ryobi, as a company specializing in the release of engines, earned the trust of consumers when she began to produce screwdrivers. Tools have different power, are high.Quality and reliable.
- Hitachi make ergonomic, modern technology, which is characterized by lightweight and quiet work.
The best screwdrivers with a 10.8 in
The models are suitable for household purposes and are able to collect furniture, as well as design from drywall.
The best screwdrivers with a battery 12 in
These models also serve for home needs. They are more popular compared to 10.8 screws in. This is due to a wider range of application. The tool is able to work with wood and even metal.
The best screwdrivers for 14.4 in
The tool relates to professional models more suitable for work in a workshop or at a construction site than at home.
The best screwdrivers for 18 in
The most professional models that can cope with any construction, installation and repair work. Great when you need to perform fasteners regularly and a lot.
Real reviews for the best screwdrivers
Egor t. About electric screwdriver Bosch GSR 1440-Li 1.5ah2 Case:
“Fully pleased with the tool. Tested in the processing of metal and wood. In electric screwdriver, nozzles are reliably attached, there is a system of protection from discharge, overload and overheating. I did not find disadvantages in the model.”
How to choose a drill-electrical screwdriver and not get into a mess
Drill-electrical screwdriver is selected according to a number of indicators depending on the purpose, that is, with domestic use, some signs are taken into account, and already with professional-others are taken into account. We describe the key features of this device:
- Twisting is one of the essential characteristics. The greater the indicator, the more powerful the tool itself is, and in its power to overcome the maximum stress. Devices that have a significant torque are suitable for drilling and twisting screws with different diameters. For this reason, they are leaning over.Inexual. In the instructions for the apparatus, it is prescribed what is the permitted drilling diameter.
- The speed of rotation is interconnected with the concept of the apparatus. At low speed. Drill large holes in diameter, on high. Small and medium.
- For full drilling, about 1200 revolutions per minute are needed, but four hundred and four hundred are enough to tighten the screws.
- Battery capacity. The working time depends on it. This indicator is indicated. A/h. In most cases, standard tools have a battery with a capacity of 1.3–1.6 a/h. However, individual models are equipped with 2 batteries, but, as a rule, these are professional facilities. Therefore, when the charge ends in one, you can transfer to the 2nd.
- The cartridge in the tool can be one and two.Fold. The bulk of the devices has a rapidly packed cartridge. One.Button. Due to the fact that the change of equipment with a two.Button is not quite appropriate, then, accordingly, for this reason, some models are equipped with rapidly removable cartridges, which significantly simplifies the process of performing work.
Reverse function, t.E. Return stroke, makes it possible to remove tight screws and pulling out the stuck. To turn on or off the reverse, a button, usually located on the handle, is intended, which is very convenient. The essence of the return passage is to change the positive and negative field in the electric motor.
You can choose a model with functions that will help to greatly facilitate the work and reduce the time allotted for repairs. For example, a drill-shurupert with a ribbon for the supply of screws. A tape with self.Tapping screws is attached to the lower part of the case, which are automatically supplied.
There is also a magnetic holder under the cartridge, backlight and indicator showing the battery charge.
How to putty drywall
Once for a major overhaul in a private house or apartment it took a lot of time: to accumulate the right amount, choose quality material, hire professional workers. Today, everyone will cope with this task on their own. Practical drywall sheets are best for the repair and insulation of premises. Various interiors, expressiveness of rooms. Your fantasy is endless. Partitions are easiest to make from the GCL precisely. But, unfortunately, after installation, the drywall sheets will not create a pleasant atmosphere in your apartment. The existing chips, cracks, joints, peeping hats of screws will spoil the overall picture. But there is a way out. This is a putty. High.Quality putty will solve all the problems that have arisen. The question arises. How to putty drywall?
Why putty drywall?
No one wants to work additionally, spending precious time on extra work, so we often think about whether to do without finish putty, because it is much easier to putty only rough? Yes, in some cases it is possible, but not in all.
Every time we have to close the joints after working with drywall, hide the hats of screws, align the irregularities that arose during installation. Also, long.Term storage of GKL or improper transportation can also make their own adjustments.
The KNAUF company, which is one of the flagships of our gypsum plasterboard production market, makes it possible to avoid puttying of GKL sheets when using them under wallpaper or tiles, not counting only the angles, compounds and scurry hats themselves.
They reached this goal with the help of a special primer. Water.Dispersion paint diluted with water. This primer on the surface of the processed sheet turns into a thin film layer, which goes well with any type of glue, and also protects drywall from damage in the event of a break in the wallpaper.
Therefore, the question of how to putty drywall is irrelevant in the case of choosing a KNAUF company.
Using a primer for GKL
There are a number of significant advantages in primer for drywall. Firstly, with its help, the adjacent materials are adequate, which greatly reduces the emergence of bubbles, peeling off the same wallpaper or tiles. Secondly, it is distributed evenly over the entire surface, which helps to reduce the consumption of materials.
The primer is always used in the decoration of the premises, especially when working with drywall, because with its help we improve adhesion with putty, reduce glue consumption when pasting wallpaper. Additionally, they use the primer after the starting putty, so that later the finish layer holds better, otherwise, you can encounter some problems, like rolling or falling off it.
It is best to choose primers depending on the type and stage of work. Putty is better to use the properties of deep penetration.
Step.By.Step instructions for performing work
When you finished installing plasterboard sheets, you have a further decoration to. If you plan to paint, putty drywall should be done at least in two stages.
The technology of putty drywall is as follows:
- Be sure to apply a primer with a deep penetration on a drywall.
- We close the holes remaining from the self.Tapping screws.
- We put the joints.
- We put putty in internal and external angles.
- We apply a primer for GKL.
- Finish the surface of the starting putty.
- Grind the irregularities.
- We apply a primer on drywall.
- Putty in the finish composition.
- We cover the walls with a primer for final work.
And now we still find out which putty putty drywall. Use both polymer and gypsum. Polymer putty is final, as they contribute to the alignment of the surface. Gypsum, are both starting and finish, depending on the size of the grains.
Putty for drywall there are different types. Ready for use, or dry, requiring water breeding. Of course, it is better to use the first one, so you are guaranteed to provide yourself from lumps that can arise with incorrect dosages dry, but it is an order of magnitude more expensive.
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Pillow the surface
Even before putty, you need to prepare the surface of drywall in advance as dry and clean material. We wash dust, various contaminants with a vacuum cleaner or a damp cloth. Prepare a primer and lubricate the walls using painting devices.
For rooms with high humidity, it is recommended to choose a special primer in order to prevent the occurrence of mold.
Mostly primed drywall with one layer, but if necessary, you can duplicate, as, for example, in the kitchen or bathroom. The following finishes can only be started after the imposed layer dries.
We seal the seams and hats of screws
For the seaming of the joints, special compounds of the Fugenfuller, Knauf Uniflot, Knauf-Fugen (Knauf-Fugen), as well as their analogues are used. These types of putty dried very quickly, so it is recommended to breed them in a small dose.
It is best to put their putty with a small spatula on the hats of self.Tapping screws, in parallel with this you can smear the seams.
The edges of the GCL have their own characteristics: along. The edge is refined, and across. Straight. Of course, the compounds of the VSTOK are slightly harder, but more on that later.
The joints are vertical
At first, when the longitudinal joints of drywall with a refined edge, the space between them is filled with puttying.
Then a sickle or reinforcing tape is glued to wet putty. This is necessary to prevent possible cracks. When using the tape, preliminary soaking is necessary for several minutes. After that, glue the tape to the joint and put down again on top.
The seams are trimmed
Putty drywall with a straight edge in the places of cut and connection of the sheets only by processing them before that. It is necessary to moisten the edges of GKL with water, and after getting wet the gypsum at an angle of 45 ° make small grooves. This work is best done before priming.