Proper primer for the walls under the wallpaper allows owners to see the beautiful flat surface after the repair. Any finishing work begins with the preparation of the necessary working surface. So the walls for sticking wallpaper, first cleaned of the old coating, and then plastered and applied primer. Only after that you can glue the wallpaper on them. The construction industry produces many different types of primer.
Primer for walls under wallpaper: composition, types and their characteristics
Sticker wallpaper, like all finishing work, needs the use of auxiliary materials. One of them is a primer for the walls under the wallpaper. It is a suspension of different consistency, which after mixing turns into a homogeneous mass of milk shade. When applied to the surface of the walls, it creates a continuous film that has excellent adhesion with most finishing materials.
The primer consists mainly of organic resins and adhesive components. The formation of the film occurs due to polymers of silicates, latex, acrylic or silicone. The solution also contains additives that impart greater plasticity or fluidity to the liquid.
Manufacturing companies are required to indicate on the package a number of parameters that the user needs to know:
- The order of preparation of the mixture and its proportions.
- The average consumption of the drug per 1 m ?.
- The way in which the material is recommended to be applied on the primed surface.
- The time during which there will be a complete drying of the layer deposited on the wall.
- The guaranteed shelf life and production date of the mixture.
According to generally accepted rules, the primer must have properties that are necessary for its direct use, namely:
- in the surface, which is processed, the composition must penetrate very deeply;
- adhesion of contacting materials with the use of a primer should be much higher;
- the surface structure of the material in the implementation of primer walls before sticking wallpaper should be strengthened;
- any primer is simply required to have an antiseptic and anti-fungal effect;
- fast drying is an indispensable attribute of any quality primer.
When choosing one or another type of primer (sometimes also called primer mixture), you need to know the following:
- Covered material. After all, plaster, concrete, drywall and other bases have completely different properties;
- the level of humidity in the room where it is planned to apply the primer;
- The primer differs in its composition for simple wallpaper and for liquid;
- even the density of the wallpaper is important when choosing a particular soil.
Helpful advice! Before going to the store to purchase a primer, prepare all of the above initial data. They need to inform the seller that he picked you the most optimal variant of the primer.
Applying a primer to the walls under the wallpaper provides for restoring order on the surface of the walls, and also ensures the creation of an excellent substrate for the adhesive composition. The solution penetrates deep into all the existing pores on the wall, holding them together and forcing out the air from there, which will prevent the formation of bubbles under the wallpaper. Disinfection of the surface occurs by the fact that the primer contains a substance that is capable of infecting living microorganisms: fungi, mold and bacteria. The primer creates excellent adhesion between the wall and the wallpaper. This is especially true in various joints and corners.
The film, which is created when primer is applied to the walls, does not allow the adhesive composition to be deeply absorbed, which creates additional savings. In addition, it makes the color of the wall uniform, which is very critical when sticking light wallpaper. Mixtures have the ability to slightly smooth out minor flaws in the surface of the walls, which makes gluing wallpaper sheets more comfortable. At the same time, the microclimate in the dwelling is not disturbed, since the walls do not stop “breathing” after using primers.
Currently, the division of all primers according to three criteria: solubility, material used and purpose. If you take the criterion of solubility, the chemical industry offers the following types of primers:
- Soluble with organic solvents: alkyds, polyurethane, latex.
- Water based are acrylic, silicate, latex and silicone primers.
- Based on natural minerals such as: gypsum, cement or lime.
According to the material used in the composition of the soil, several types can be distinguished and indicate their properties and the preferred surface for processing:
- The alkyd primer is best suited for coating certain metallic and concrete types of surfaces, as well as wooden structures. Its drying time is not more than 14 hours;
- acrylic primers are used on wooden, plastered or brick walls. Can be used on surfaces of fiberboard and particleboard. Dry in 2-3 hours;
- polyurethane is good to use on highly dusty or poorly absorbent surfaces. Drying time is about 24 hours;
- silicone primers can be found on concrete, plastered or lime-sand walls. They dry no longer than 5 hours;
- Latex primer for walls under the wallpaper is suitable for at least some type of surface, dries in just 2 hours;
- silicate and mineral types of soils are successfully applied on a plastered, brick or concrete surface. Both of these types are dry for at least 24 hours.
Helpful advice! It is completely unacceptable to treat surfaces containing gypsum with a silicate primer. They are not intended for these purposes and lead to loss of strength properties.
According to their purpose, all primers are divided into several separate types:
- universal application. They are water based;
- having a specialized purpose: anti-fungal, antibacterial or anti-corrosion;
- preparations with deep penetration up to 15 mm to the surface;
- having insulating properties;
- the so-called concrete contact, which allows to provide the best adhesion to concrete surfaces.
The primer of the walls before wallpapering is usually carried out using universal, alkyd, latex, acrylic primers or ordinary wallpaper glue.
Consider the method of application of a particular soil. Acrylic primers are applied to the walls with a roller. In places where this is not possible, apply a brush. Depending on the quality of the primed surface make two or one layer. On the drywall always put 2 layers. The advantages of acrylic look in its versatility. It is suitable for almost any wall.
Helpful advice! It is very easy to remove old wallpapers from acrylic-treated walls. They just need to moisten with heated water.
The latex group is often used on collapsing surfaces, as it is capable of holding particles of a substance together. Alkyd primers create a moisture-proof film and destroy the mold. The rust blocking property allows this type of primer to be applied on reinforced concrete surfaces.
Universal types are applicable for any surface, which makes them the most popular. However, do not put them on crumbling walls. For this it is better to choose a more specific type of soil. Priming the walls before sticking wallpaper with a universal primer ensures that all requirements for the quality of work are fulfilled.
There are both domestic and foreign brands on the market of finishing materials. One of them is Ceresite. Under this brand comes several types of primers, which have shown themselves very well. The domestic manufacturer Skif-Impex produces the entire line of primers for various purposes. Another well-known manufacturer is the company UNIS, which is also famous for its high quality products.
It does not matter which brand of primer to choose, it is important that the composition was of high quality and certainly affordable for wide use. The use of primers for priming walls before sticking wallpaper today seems to be an essential element of repair.