Knauf Fugen putty: pros and cons

Knauf Fugen putty: pros and cons

German quality is always based on the desire to achieve the desired result, on hard work and love for what you do. The Knauf brand has repeatedly proved to its adherents all its power and high-quality approach to business..

One of the building mixtures that the Germans can be proud of is Knauf Fugen putty..


Knauf Fugen gypsum universal putty used to have a longer name – Fugenfuller. This is a classic gypsum-based putty, which has firmly established itself in the world market of dry building mixtures..

The main feature of this material is the guarantee of success at any labor costs, provided that the instructions are followed unconditionally:

  • Observe the room temperature and air humidity. So, in the room where the surfaces will be treated with Knauf Fugen putty, there should be no more than +10 degrees Celsius. And the humidity should not exceed the standard indicators of 70-80%.
  • Pre-treat surfaces with a primer, clean and dry.
  • Tools for work must always be clean, otherwise the mixture risks acquiring a heterogeneous structure and, as a result, will not meet your requirements..

It should also be remembered that this type of putty is not suitable for large-scale projects. In order for it to lie down evenly, it must be applied in a thin layer, no more than three millimeters..

The gypsum base of the mixture does not allow using a large amount of putty for a long time. It dries very quickly, therefore, it is recommended to dilute the mixture in small quantities..

Due to its crushed structure, Fugen can be used as a top coat before applying paint, gluing wallpaper, etc. Of course, one layer may not be enough, because, like any other gypsum putty, it will certainly shrink.

Many users note the difficulties they face in the process of processing Knauf Fugen surfaces. It is advised to resort to less capricious analogues, which are inferior to the German manufacturer not only in price, but also in quality. And, therefore, in the end result.

In general, Knauf Fugen putties have positive reviews, but sometimes not the most pleasant words about a professional product happen..

Advantages and disadvantages

Since there are three main types of Knauf Fugen putty, the manufacturer on its official website indicates not only the general advantages of this wonderful material, but also individual ones for each type:

  • Knauf fugen – for processing the edges of the gypsum plasterboard, does not crack after drying, the putty is made from an environmentally friendly, pure natural material – gypsum.

  • Knauf fugen gf – for continuous filling of gypsum fiber board, sealing joints and Knauf floor elements. Differs in high strength and elasticity, absence of cracks on the treated dried surface. HS is the same gypsum, but with polymer additives that do not have a harmful effect on the human body.

  • Knauf Fugen Hydro – moisture-resistant plaster putty for processing gypsum plasterboard joints and mounting gypsum plasterboards, the fastening of which is called tongue-and-groove. The product gives minimal shrinkage, does not crack, and is maximally resistant to moisture, as it contains environmentally friendly polymer and hydrophobic additives.

Even professional mixtures cannot do without minuses and shortcomings. Among the most serious and constantly occurring: fast drying in a mixing container, inconvenience associated with sanding, the ability to apply only in a thin layer.

The versatility of Knauf Fugen putty is only useful to those who are ready to use it as an additional pre-treatment agent. As an independent finishing material, it is not suitable enough.


To calculate the correct dry mix as accurately as possible, you should familiarize yourself with the basic characteristics of the material used..

Technical characteristics are in the description of the features of the dilution and laying of the putty on the surface:

  • excellent fine-grained structure, characterizing the material as a solid finishing layer. Maximum grain diameter – 0.15 mm;
  • the layer thickness varies from one to three millimeters, which allows the putty to be used as an inconspicuous base base;
  • from one kilogram of the dry mixture, one liter of three hundred grams of the solution prepared for use is obtained;
  • the prepared mixture can be used for no more than half an hour until it dries completely in a mixing container;
  • shelf life of dry mix – 6 months.

Knauf Fugen multipurpose plaster mix components create a high-strength base for subsequent surface treatment. The Hydro variety often acts as a starter filler, since its physical characteristics allow its use in damp rooms. It protects walls from mold, mildew and vermin.

Customer reviews on the technical characteristics specified by the manufacturer note that everything is true. Due to the large amount of information and its properties, the putty gains credibility in the eyes of both professionals and beginners who first used this method of interior decoration..

Dry mix packaging is paper bags weighing 5, 10, and 25 kilograms. They must be stored in cool dry rooms, protected from frost, on a wooden substrate.. If a bag break is found, this putty should be used first., but only if it does not get moisture and does not stick together. Reuse of wet putty is not possible.

The instructions for use of Knauf gypsum-based putty explain how to properly dilute and use the mixture with maximum efficiency. It also shows the approximate consumption of putty, depending on its purpose..


First of all, the amount of putty will depend on what kind of work it plans to perform. And also an important factor is the surface on which Knauf Fugen will be applied. If you just need to close up drywall joints, you need 250 g per square meter of coverage. Continuous puttying of walls with a layer of up to 1 mm may require from 800 g to 1 kg per 1 m2.

Knauf Fugen GF has a slight difference from the previous type of putty in terms of consumption, since the thickness of the coating here can already increase up to 5 mm:

  • for processing and covering joints and seams, it can take up to 600 grams of the finished mixture;
  • when applied to a solid wall – 1.2 kg or more can be dispensed with.

Moisture resistant putty is applied in almost the same way as GF, therefore the consumption is the same. Knauf Fugen Hydro can have different colors: rarely – white, more often – gray and even with pink shades. This is due to natural additives in gypsum, which do not affect the technical parameters of the putty and do not acquire a pronounced color after application and drying..

The price of Knauf Fugen and GF ranges from 400 rubles for a 25-kilogram bag. Hydro, in comparison with them, will have a higher value due to its waterproofing and moisture resistant properties. The cost of such a putty is almost twice as high – up to 1200 rubles. for 25 kilograms of dry mix.

Scope of application

Knauf Fugen standard gypsum putty mixture is intended for interior work of the following nature:

  • processing of gypsum board joints (Knauf-sheets) with any edges, using paper reinforced tape;
  • as glue for fixing Knauf sheets on a flat surface, as well as for gluing and processing gypsum parts;
  • disguise caps of screws on the coating;
  • filling connections of concrete structures;
  • alignment and correction of probable defects in wall sheets;
  • as a starter cover, on which you can glue the wallpaper.

With the Knauf Fugen GF mixture, it is very convenient to putty GVL and GKL. At the same time, GW is also used to treat drywall walls with visible mechanical damage.. It very easily masks all surface imperfections. It is customary to prime drywall before puttingty. This process helps to give the wall the desired shape..

Knauf Fugen Hydro putty is known for its area of ​​application for the treatment of wet rooms. This mixture is the most flexible among its “brothers” from the Fugen line.. With its help, you can also give the plasterboard the necessary arched, semicircular shape., no fear of cracking after drying.

The use of Knauf Fugen putty on drywall is advantageous. After all, it not only helps to align the joint seams and can be a starting layer for further wall decoration.

The solution of this putty is very convenient for installing gypsum boards. During the installation process, Fugen is applied into the recess (groove) of the lower row of plates and into the vertical groove from the end. The gypsum plasterboard is pressed tightly, the protruding putty residues are removed. Then there is a process similar to laying bricks with cement mortar..

Any ready-made Fugen mixture dries equally quickly both when applied to the surface and lying quietly in the container where it was diluted. It takes no more than 30 minutes to dry, so it is very important to do everything right from the first layer.

Application recommendations

Before applying the putty to the walls, it is necessary to acquire all the tools necessary for this process, indicated in the official instructions for the mixtures:

  • container for the preparation of putty;
  • metal spatula for mixing;
  • mixer for plaster;
  • standard metal spatula (15 cm);
  • wide metal spatula (more than 20 cm);
  • metal spatula for processing corners;
  • abrasive mesh for sanding the dried surface after putty.

Experts recommend: before applying paint or pasting wallpaper, you need to walk on the putty surface with finishing mixtures.

The mixing container and all instruments must be thoroughly washed and free from residual traces of previous mixtures or use new ones. In a dirty container, fresh putty dries twice as fast, its service life is reduced to 15 minutes.

If unpleasant irregularities remain on the wall, they should be rubbed after drying with a special float. All instruments must be made of stainless steel.

To mix a solution of the correct consistency, you should pay attention to the following points:

  1. Pour dry putty (1 kg) into water (0.8 l) slowly, spreading it throughout the volume. Handicraft is especially important here..
  2. As soon as the level of dry putty slightly exceeds the level of water in the container, let the mixture brew. You can take no more than 2-3 minutes for this..
  3. Proceed with active kneading. In rare cases, you can use a construction mixer, but professionals insist on manual mixing of the mixture..

At first it may seem that the consistency is too liquid to be applied to the walls. However, after a couple of minutes, the density will noticeably increase, and the solution will become as it should.

Another tip: never dump the remaining grams of finished putty from the putty knife into the general container. This reduces the service life of the mortar and leads to accelerated drying of the still unused putty..

          It should be noted that for the initial application, a more liquid consistency of the putty is suitable, to make it easier to apply a thin even layer up to 3 mm. For further use and for patching up irregularities, cracks and other flaws, a mixture that is thicker in structure is suitable. Then the layer thickness will not matter so much..

          You will learn more about the features of applying Knauf Fugen putty in the following video.

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