Construction of houses

Primer Ceresit: properties, consumption, application

Even a novice builder knows that a residential building should not only be functional, that is, protect from cold, wind and dampness, but also aesthetic, which is determined, first of all, by the decorative design of the facade. It involves plastering and facade painting of walls, which cannot be done without using a primer. The construction market is replete with a diverse assortment of primers, which baffles not only novice craftsmen, but also experienced developers who often hesitate when choosing the best quality construction products. The basic rule for choosing a primer is that before you go to the construction market, you must clearly understand what hopes are pinned on a particular primer, and what construction tasks it should perform. To facilitate the task for developers, experts suggest classifying the primer according to its purpose: for metal, wood, reinforced concrete surfaces, universal primer and special-purpose primers. The market for reliable and high-quality primers, time-tested, is headed by the Ceresit primer, which is presented on the market in several modifications, the most popular of which are Ceresit primers CT 17 and CT 16. In this article we will try to understand the reliability of this statement and help our readers to decide on selection of quality primer material.

What is Ceresit primer?

Practitioners say that Ceresit primer is a universal water-dispersion primer, made on the basis of synthetic resins. Numerous fans of Ceresit products appreciate it for its unique ability to deeply penetrate the surface to be treated, which helps not only to increase its adhesive characteristics, but also to prevent premature drying out of primer mixtures with subsequent formation of cracks, leading to premature destruction of the base. The manufacturer offers several varieties of primer mixes, each of which has unique characteristics and functional purpose. The greatest demand is for modifications of ST 17 and ST 16, the characteristics and scope of which we will consider further.

In addition, the manufacturer offers a primer Ceresit CT 19, intended for the treatment of concrete surfaces before applying plaster..

We hope that the information presented in this material, which is of high practical value, will be useful to you, and armed with it, you can easily choose and buy a Ceresit primer..

Primer Ceresit CT 16: basic characteristics

The primer Ceresit CT 16, known in wide construction circles, is manufactured on a water-dispersion basis, is used in the process of external and internal work and is applied exclusively to the base before the direct application of decorative plaster. The use of this primer mixture allows high-quality preparation of the base to be treated, which is the key to strong adhesion of the paint and varnish material and, as a result, a reliable and durable coating.

Scope of the material

The field of application of the primer for decorative plaster, as the manufacturers call the modification of ST 16, is quite diverse and implies the application of this primer composition to the following types of surfaces:

  • Concrete;
  • Cement-lime, cement-sand and gypsum plasters;
  • Chipboard and plasterboard boards;
  • Durable paintwork;
  • It also implies the processing of the base protective layer in the process of arranging the external thermal insulation systems of the Ceresit facades.

Important! A distinctive feature of the primer for decorative plaster is the inclusion of fine quartz sand in its composition, which gives the primed surface a rough structure. It is thanks to this property that the adhesive characteristics of decorative coatings increase..

Main production characteristics and consumption

  • The primer of this modification is produced in white, however, if necessary, it can be tinted to match the color of the treated surface, including in accordance with the color card proposed by the manufacturer. In appearance it is a thick liquid of white color and homogeneous structure;
  • The structure of the primer composition CT 16 is represented by an aqueous dispersion of acrylic copolymers, supplemented with pigments and mineral fillers;
  • The optimum temperature for using the primer is variable and ranges from +5 to +30 degrees;
  • Drying time of the treated surface does not exceed 3 hours;

Important! The consumption of the Ceresit CT 16 primer is a variable parameter and depends on the absorbency of the substrate to be treated. On average, this indicator does not exceed 0.2 – 0.5 l / m2.

Primer properties

The high quality of the coating and the effective performance of the unique functions of the Ceresit CT 16 primer is achieved due to its properties, which are as follows:

  • An increase in the adhesion strength of the surface with decorative plaster is achieved by increasing the adhesive characteristics of the treated coating. This condition is fulfilled due to the inclusion of fine-grained quartz sand into the structure of the primer, which increases the surface roughness;
  • Despite the fact that the base color of the primer is white, the unique characteristics of the material expand the field for builders’ activities and suggest the possibility of tinting, which is especially important in the case of choosing colored decorative plaster that retains its color after application, excluding the translucency of the base;
  • An important property of the primer of this modification is the unique ability to reduce the moisture content of the treated surface, which guarantees the achievement of an optimal drying regime;
  • Increased vapor permeability and the absence of synthetic solvents in the primer, which is a guarantee of the environmental safety of the material;
  • Full readiness of the mixture for use, and therefore, it does not need additional preparation and is characterized by ease and speed of application.

Conditions for applying the primer

Before proceeding with the application of the primer, the surface is thoroughly cleaned of dust and dirt that reduce the adhesive characteristics. All irregularities on the surface must also be removed. Areas covered with algae are cleaned with steel brushes.

Important! Cover areas that you do not plan to prime, such as window frames, doorways, with masking tape.

The primer does not need to be diluted with water. All that needs to be done before applying the primer is to shake the package. Prepare a brush to apply the primer.

If the primer gets on the laying coatings, it is washed off fresh with water, and when it dries – with the help of a solvent.

Primer Ceresit CT 17: basic characteristics

According to the manufacturer, the Ceresit ST 17 primer is a universal primer, which allows it to be used for treating surfaces with different physical properties. To be convinced of this, it is enough to familiarize yourself with its widest field of application..

Scope of the material

  • Treatment of absorbent surfaces to reduce their moisture before direct installation of ceramic and stone tiles;
  • Surface treatment before applying plaster or leveling floor mixes, while they can be located both outside and inside the building;
  • Pre-treatment of the surface before painting the building or installing thermal insulation materials;
  • Processing of aerated concrete and gypsum plasters;
  • Plasterboard and chipboard processing.

Thus, this modification of the Ceresit primer, the characteristics of which will be discussed below, can be applied to the following surfaces:

  • Concrete and brick;
  • Acrylic, water-based paint;
  • Styrofoam and expanded polystyrene surface;
  • Surface of materials treated with formaldehyde impregnations, such as chipboard and fiberboard;
  • Plasterboard surfaces.
  • Chipboard, cement chipboard and fiberboard surfaces.

Main production characteristics and consumption

  • The structural composition of the Ceresit CT 17 primer is represented by an aqueous solution of polymers, namely, yellowish synthetic resins;
  • The operating temperature is also variable and ranges from +5 to +35 degrees;
  • The time for complete drying depends on the conditions under which it occurs. On average, this indicator does not exceed 4-6 hours;

Important! The consumption of the Ceresit CT 17 primer depends on the absorbency of the treated surface and, with a single application, is 0.1 – 0.2 l / m2.

Primer properties

The versatility of the Ceresit primer, the price and quality of which fully correspond, is one of the most important properties for the consumer, which makes it possible to refuse the purchase of various primers for each separate type of construction work. By purchasing a primer Ceresit ST 17 in cans of 10 liters, you can save not only on material, but also on its cost, since with an increase in the volume of packaging, the price per liter of material decreases. If you plan to carry out a small amount of finishing work, then experts recommend purchasing smaller containers – 1 or 5 liters each.

When it comes to outdoor work, for example, putty and painting of fences or facades, experts recommend giving preference to the Ceresit ST 17 primer, precisely because of it universality. For example, if we talk about the warming of facades, the masters know that this is a step-by-step process – first, the surface is primed, and then it is warmed. To prevent the destruction of the insulation, it is also primed, plastered and painted. Moreover, each described process involves the use of a primer mixture. And, in this case, it is obvious that it is better to purchase one universal deep penetration Ceresit primer and use it at every stage of finishing than to buy a large number of different primers. In addition, it should be noted that this primer mixture is made in two versions: summer and winter (frost-resistant) versions..

Important! Experienced craftsmen claim that in the process of finishing work you can use any putty, and the end result will depend not on its quality or brand, but on repeated surface treatment with a Ceresit ST 17 primer mixture. However, if you choose the wrong proportion of the finishing putty and water, then after sanding it, you can notice its crumbling on some parts of the walls. But if you do not neglect the use of Ceresit primer before direct sanding of the surface, you can easily avoid these micro nuances..

Increasing the adhesiveness of the coating – one of the most important properties of the primer mixture. Since it penetrates the surface to be treated at the molecular level, the topcoat will not fall off or peel off..

Deep penetration Ceresite primer, this is how the manufacturers call the modification ST 17, characterized by the maximum amount of ultrafine particles of components with binding properties, which allows the primer to bind the smallest components on the treated surface – grains of sand, dust particles, all kinds of impurities, which makes it possible to give the surface not only high strength, but also absolute smoothness.

As part of the primer mixture Ceresit CT 17 no solvents, which guarantees complete environmental safety material.

Main protective functions of a deep penetration primer

  • The use of a primer helps to strengthen the treated surfaces and prevent their destruction. By applying a primer on all types of building surfaces, with the exception of non-absorbent ones, you prevent their premature deformation;
  • Prevention of rejection and destruction of finishing materials applied to the primed surface;
  • Protection against mold, moisture and mildew. In this regard, many masters argue that under no circumstances should the priming of the surface be neglected, since it is an antiseptic prevention of various injuries;

Important! Characterizing the surfaces treated with various primers, builders note that on a gypsum plasterboard surface treated with various primers, the greatest roughness, and, as a result, hydrophobicity was retained by the surface area treated with Ceresit ST 17 primer;

  • Protection of the treated surface from dust. Having primed the surface with this mixture, you will see how they shine;
  • When applying thin-layer leveling compounds, it is also recommended to use a primer, as they prevent them from drying out and the formation of bubbles on the surface;
  • Since the primer Ceresit CT 17 does not reduce the vapor permeability of the surface, it can be used for processing screeds equipped with heating.

Sequence of works when applying primer Ceresit CT 17

Despite the fact that the simplified standard instructions for the use of the primer composition is placed by the manufacturer on the label, we believe that each type of construction work has its own nuances and therefore we suggest that you carefully read the following recommendations.

Before applying the Ceresit primer concentrate to the surface, it must be treated in the following order:

  • First of all, remove fragile areas using brushes with steel bristles;
  • Then the surface is leveled, during which all sagging is removed;
  • Remove biological corrosion caused by fungi or mold, which can be done mechanically or by treating with a special compound;
  • Further, the surface is cleaned of dust, grease and other tiny particles that can reduce the adhesive properties of the primer;

Important! The preparation of the surface to be treated is ideally carried out one day before applying the primer. Before direct application, the canister with the primer mixture is shaken, after which the composition is applied to the surface using a wide brush, brush or roller. When applying the primer in hard-to-reach places, use a narrow brush.

  • Processing in two layers is allowed, while, when applying the first layer, it is allowed to dilute the primer by 1/3 with water. If you work in a temperature other than that indicated on the package (from +5 to +35 degrees), the drying time of the surface may vary.
  • After the treated surface has dried, check the degree of its hygroscopicity (absorption). If necessary, re-treat the surface. For example, highly absorbent aerated concrete is processed twice. In this case, the first layer is applied using a solution of 1 part consisting of a primer and 1 part of water. Subsequent processing is carried out after the first layer has completely dried..
  • Experienced practitioners recommend an alternative way of treating facades, which involves applying a primer to the surface, after a short drying of which, the facade paint is immediately applied. After use, the instruments are immediately rinsed with water. The residues of the primer are also removed with water, and if it dries, with a solvent..

Important! All work must be carried out in dry conditions, with a relative humidity of not more than 80%. The technical indicators of the material stated above coincide with the reality at a temperature of 20 degrees and a relative humidity of 60%.

Thus, the Ceresit ST 17 primer mixture not only effectively copes with the construction task set before it, but also increases the aesthetic characteristics of the surface, ensuring its ideal processing..