Primer wall before pasting wallpaper

quality and durability pasted in the major or minor repairs wallpaper largely depends on the correct approach to the preparation base.Earlier, before wallpapered room, the walls needed a preliminary pasting newspapers or wetted with diluted wallpaper paste, but now only produce enough to wash the walls before the wallpaper.

Purpose primer composition

primer is a composition made on the basis of natural or synthetic film-formingelements with minor amounts of pigments and fillers.

Compared to newspapers and wallpaper paste, which in the recent past have contributed only improve the adhesion between the bonded materials, priming the walls before gluing wallpaper has a number of additional functions:

• strong adhesion of the upper base layer, preventing cracking and subsequent shattering the plaster, whereby rough coating becomes more dense wall structure;
• alignment minor depressions, which reduces the risk of air pockets;
• decrease the absorbency of the treated surface, so that the wallpaper paste is applied evenly, thereby contributing to the economy of the adhesive composition;
• semi-matt film eliminates the translucence of the concrete or other dark base through thin wallpaper;
• protects the wallpaper from the formation of mold, mildew, as formed after the primer has dried condensate film prevents direct access to wallpaper;
• cleans the surface of construction dust, deteriorates the quality of the bonding materials.

Thus, a primer for walls under the wallpaper - a rather significant point in the surface preparation for subsequent finishing.However, the quality and duration of trouble-free operation of wallpaper depends on the primer of conformity and the treated surface.

primer Choice

Features a huge number of primers on the market today, it is largely determined by the process used in the manufacture of the composition of substances and elements that have different effects on concrete, metal, glazed surface coating of wood, etc..

Depending on the degree of impact on the surface to be treated, all the variety of primer compositions is divided into:

• strengthening - affect only the surface layer of the wall without penetrating the structure of the material.After drying the primer composition formed a film thickness of 1-2 mm.Primers reinforcing nature is ideal for wood, metal surfaces;

• deep penetration - not only act on the surface of the base, but also on the structure of the material being processed.Primers deep penetration contain binders 10 times smaller than the strengthening composition, allowing the mixture to penetrate into the deeper layers of the processed material, reaching a thickness of 1 cm. The most commonly used for priming plastered surfaces, concrete and other materials that tend to fracture and shattering.

From the main component primer divided into alkyd, mineral, acrylic, polyvinyl, Gliphtal and many others.However, during the finishing works inside the building more suitable:

1. Acrylic compositions used for priming all surfaces.The only exceptions are the metal surfaces, as rust over time still seeping through the protective film as a primer based on acrylic rarely contain corrosion inhibitors.Preferred features are the acrylic primers:

• no peculiar smell;
• ease of cleaning tools used for priming under a stream of warm water;
• speed of drying of one layer, which occupies 1-4 hours.

However, water-dispersion acrylic primer reduces the stability of the coating film to the adverse effects of the environment, so it is suitable to perform the work at a temperature above + 10 ° C.

2. Alkyd compositions are produced on an organic basis and contain corrosion elements, so apply for the processing of metal and wood.Reinforcing primer on alkyd are highly resistant to various kinds of pollution, as well as the good performance of weather resistance, they can be used when priming the walls of the porch, summer kitchen.However, the presence of a specific odor makes it necessary to ventilate the room during the work up to the complete drying of the composition.Unlike acrylic, alkyd primer dries during the day.In addition, the instruments after work will have to throw out because they completely wash unlikely.

Thus, when selecting a primer should take into account the level of humidity in the room, as well as material on which to apply the primer.In most cases, the best option for wallpaper primer acts as an acrylic composition, deep penetration.

Surface preparation

Before you apply the primer to the wall, it is necessary to prepare the surface as follows:

• get rid of residual adhesive, wallpaper on the wall by means of a spatula and water;
• remove from the walls of the mold, if any, by applying the chlorine solution, followed by washing the treated site with warm water;
• clear the wall from loose pieces of putty with a spatula, sanded the rust on metal, remove burrs and roughness with wooden flooring;
• brush dipped in primer acquired, moisten the defective place and putty;
• check the degree of drying putty places through a piece of cellophane size 15x15 cm pasted on the wall. To do this the night before the cellophane tape is attached to the wall on all sides.If in the morning a polyethylene no condensate, the coat is completely dry out and can move on to the walls of the primer (see video at end of article).

process of priming

Before you begin to direct priming the walls, it is desirable to protect any exposed skin as a part of the elements of the primer may cause allergic reactions.

primer walls must at least begin to glue per day to each layer, and there should be at least 2, had a good dry.

On the prepared surface primer is applied with a foam roller or spray, and in hard to reach places - by a wide brush.

work is performed in the following order:

• moistened places elimination of deficiencies;
• after drying primer is applied evenly over the entire surface, not forgetting to handle all angles;
• next layer of primer is applied similarly to the first 3-4 hours.

After drying all layers of primer can be diluted glue and start finishing walls with wallpaper.

Thus, if correctly matched primer and correctly carried out to wash the walls - wallpaper peeling off hardly.