Knauf putty is one of the most common finishing materials today. And there are explanations for this: it is easy to use, does not require special skills to work and does an excellent job of leveling any surfaces..
The putty has a fairly wide choice, and differs in its granularity – there is a coarse-grained, medium-grained and fine-grained putty. All of these species have one task – to level the surface. But the choice of this or that type of putty will depend on what kind of surface quality is needed. To obtain a perfect surface or close to it, use a fine grain putty. From here it got its name – finish.
After processing the surface with such a putty, you can do anything with it: primer, paint, glue wallpaper, cover with any decorative coatings, or you can do nothing at all – leave the surface as it is.
There is now a huge selection of finishing putty on the market, differing in quality and price. The leading positions in all their diversity are occupied by the putty of the German brand “Knauf”. It has a number of advantages and its own characteristics..
Finishing putty “Knauf” is based on gypsum or cement material in combination with various polymer additives. On sale, it is presented in a convenient packaging form from 5 to 25 kg. Has a pleasant color, close to white or gray, and is used for both external and internal work indoors.
Possesses the following beneficial properties:
- resistance to high humidity;
- is an environmentally friendly material;
- does not require a large thickness in its use, which speaks of its economy;
- applied to previously plastered surfaces, masking as much as possible any of its roughness and irregularities;
- works great with drywall, sealing the seams between sheets, and also allows you to locally level the walls in places of unevenness;
- after drying, it has a fairly high strength and does not crack – the high adhesive properties of this putty will not allow it to move away from the surface;
- shelf life is 12 months.
A significant disadvantage is the fact that the putty can only be open for a day. After that, it is not recommended to use it..
There are some differences in the finishing coat. In its composition, it will differ slightly depending on the type of surface material on which it will lie: concrete, cement plaster, gypsum fiber, drywall or brick.
The finishing putty is divided into four main types:
- Cement. For example, Knauf Multy-Finish. It comes in gray and white. Suitable for surfaces such as cement plaster and concrete. Can be used to fill cracks and holes in exterior façade and interior work with high humidity.
- Gypsum. The variety of gypsum plaster is very extensive. It makes no sense to dwell on each of them separately, but an example of individual brands should be given, for example, Knauf Uniflott.
Its basis is high-strength gypsum mixed with polyester additives. It is mainly used for sealing drywall joints. Due to its strength characteristics when performing work, it does not require a reinforcing tape (serpyanka).
Knauf Fugen Gydro is distinguished by its high moisture resistance. Therefore, like GKLV, it can be used in bathrooms. There are also universal gypsum putties for various types of work..
- Polymer. This type can be attributed to Knauf Polymer Finish putty – it is a dry white mixture based on a binder polymer substance. Due to its high adhesion, it is not afraid of cracks, and due to the presence of microfibers, such a composition does not shrink..
- Ready mixes. The main feature of the finished putty is that it does not need to be diluted. This is a ready-made mixture, which is based on vinyl. Has a distinct white color. It is used for flat surfaces along with previous compositions. This includes pasta brands Knauf Rotband Pasta and Polimer Finish. Available in containers of 18 kg.
As mentioned above, the finishing putty is characterized by a low application thickness. However, this thickness may vary depending on the surface itself and the type of putty..
The consumption of putty per 1 m2 will be prompted by the instructions. However, in reality, these numbers are different. The manufacturer specifies the values that apply to the ideal wall surface. In practice, the picture may be somewhat different. Naturally, before starting the calculations, you need to decide on the type of surface and the type of putty mixture..
Ideally, gypsum putty will require approximately 0.8 kg per 1 sq. m surface. This figure will change depending on which surface. For example, if it is a brick with many seams and dents, then boldly need to add the same amount to this figure. In the case when the surface is drywall, then you can focus on it.
If we apply a vinyl ready-made putty to this example, then here it is already necessary to start not from 0.8 kg per square meter, but from the figure of 1.2 kg. Everything else is the same, and is acceptable to any type of putty.
How to apply?
Before applying the putty, you need to take care of the surface. There is one simple rule: the smoother it is, the better. This will play a huge role both economically and technically..
Before starting work, it is imperative to treat the surface with a primer mixture – it will provide better adhesion (adhesion) of the putty. Then you need to choose a spatula. The smoother the surface, the wider the spatula can be taken – this will shorten the working time. For corners and difficult areas, use a smaller trowel.
The entire process usually takes place in two stages. In the first, the largest cracks and depressions are closed, and in the second, the entire surface is putty.
You must have two spatulas in your hands. You need to scoop up as much of the prepared solution as possible with one of them and keep it in front of you. The second should work, consuming the mixture from the first spatula. In this position, you do not have to bend into the container for the solution every time. When applying, hold the working trowel at an angle of 45-60 degrees in relation to the wall.
There is another way: you can apply the putty to the entire wall at once with point slaps, and only then level it. This is a matter of taste and largely depends on the surface itself. If it is flat and close to perfect, then the second method is perfect. In this case, you can use not a spatula, but a rule with a length of 1 to 2 meters. The savings in time and costs are evident. When applying it is necessary to control the layer thickness. This is one of the mandatory rules to help avoid problems with cracks and delamination in the future..
The thickness of the finishing putty may vary depending on its type. But usually for a gypsum version it is from 1 to 4 mm, and for a cement version it can be 2-6 mm. This value can be found on the product packaging. The main thing is not to exceed it. With a thick layer, the putty will dry for a very long time, which can lead to its future cracking and deformation of the layer as a whole..
In addition to flattening the surfaces of walls and ceilings, putty can be applied so that an original embossed pattern is obtained.
To do this, the solution should be brought in such a way that it resembles a thick curd mass. The readiness of the solution can be easily checked – for this, a solution of 100-150 g should be applied to the spatula and tilted vertically. If the solution does not deform and does not slip, then it is ready.
Then you need to apply it in small portions so that the desired texture is obtained. To do this, the spatula must be applied flat to the putty area, slightly pressing and lifting its lower part. By working in this way in different directions and with different intensities, a rocky surface can be obtained. After the putty dries up, it should be wiped off a little from the excessively protruding parts of the “rock”. This can be done with ordinary sandpaper or a damp hard sponge..
There are many different ways to give the surface of a particular texture using rollers, polyethylene and other tools..
After completion of work, it is necessary to rinse all tools and containers from under the solution in warm water.
On the Internet, as well as on magazine pages of publications devoted to construction and repair, you can find a huge number of positive reviews about Knauf putty. And this is understandable, because the company is the most popular in the whole world. This German corporation has been a manufacturer of finishing materials for over 80 years..
Among the reviews, the following statements of the masters can be traced:
- ease of use;
- easy to apply;
- has no lumps;
- time to prepare the solution takes a few seconds;
- has high adhesion;
- does not lose its properties for a long time, which justifies itself 100%.
All expert reviews can be reduced to one thing: Knauf products are of excellent quality that meets all the manufacturer’s stated requirements..
For information on how to level the walls with Knauf putties, see the next video.