Plot of walls before plaster – which one to use

Plastering walls is a critical step in creating a smooth, long-lasting finish. The quality of your plaster job can be greatly affected by the preparation method you select. You can accomplish the greatest outcomes for your project by being aware of the various options that are available to you.

Applying a bonding agent to the wall surface is one typical technique. In particular, bonding agents improve plaster adhesion on smooth, non-porous surfaces like painted walls or concrete. They lessen the possibility of cracks and detachment by producing a rough texture that the plaster can cling to.

The application of a primer or sealer is another common option. These products pierce the wall’s surface, sealing it and giving the plaster a solid foundation. Primers are especially helpful for maintaining even coverage and preventing plaster from drying out too quickly on porous surfaces like brick or drywall.

It may be necessary to apply a base coat or undercoat to walls that have significant damage or uneven surfaces. By smoothing out surface imperfections and filling in cracks, these denser materials can produce a more even base for the last layer of plaster. In order to look polished and professional, you must complete this step.

Depending on your desired finish and the state of your walls, each of these methods has advantages. By using the appropriate preparation method, you can improve the durability and aesthetics of your plasterwork and guarantee that your project will turn out well.

Surface Type Recommended Primer
Concrete Acrylic Primer
Brick Latex Primer
Drywall Water-based Primer
Wood Oil-based Primer
Metal Rust-inhibiting Primer

Primer under plaster, why is it needed

Adhesion, adsorption, and wettability are just a few of the unique physical and mechanical properties that define each processed surface in addition to its structure. They use a type of "intermediary"—an intermediate layer of a unique composition that enables you to bring the aforementioned physical attributes to a particular average level—in order to guarantee the predictable outcome (quality):

  • Lease irregularities. So, a primer for brick for plaster will differ in composition from the one that will be needed for a tree;
  • Increase the level of adsorption. Glue and paint are preserved longer on a pre -treated surface;
  • Ensure the required degree of adhesion, for example, for pasting walls with wallpaper;
  • Get a protective waterproofing effect. Some materials are aggravated over time and become unusable.

For what surfaces is the primer primer is used

If the base is fairly solid and smooth, it is occasionally possible to skip the wall primer step before plastering. Nevertheless, most surfaces do not meet these requirements after a standard repair.

Particular handling is necessary for:

  • Porous surface. For example, concrete or brick;
  • Plastered wall. It is true for asbestos -cement grounds;
  • Wooden structure. Typically, a primer for plaster walls made of wood contains special additives that prevent mold;
  • Plastic or other inorganic material with similar properties;
  • Metal. The soil contains special components that prevent the appearance of corrosion.

Wood-based plaster wall primers typically have specific ingredients in them to stop mold growth.

Prior to plastering, selecting the appropriate primer for your walls is essential to guarantee a smooth, long-lasting finish. In order to avoid problems like peeling and cracking, the primer serves as a bonding agent between the plaster and the wall. Different wall types, such as brick, drywall, or concrete, have different primers made specifically to meet their needs. Knowing which primer to use can help you save time, money, and effort while guaranteeing a polished finish and a strong base for your plaster.

Types of soils for plaster and their composition

The variety of tasks that arise during repair work dictates the type of primer that is needed for plaster and which one to select for a given situation. The choice is frequently influenced by the surface’s characteristics, the kind of materials used, and the operational environment, including humidity, temperature range, and exposure to the outside world.

Each soil type is classified according to its use and chemical makeup:

  • Acrylic. In this case, it does not matter what primer to use before plaster walls is a universal mixture suitable for most finishing work;
  • Mineral, based on gypsum (less often cement). Here the choice determines the material of the base;
  • Glyftal. Intended for metal or wood;
  • Acrylic. Good option for porous coatings;
  • Polyvinyl acetate. Specialized composition for special types of paint.

When necessary, the priming of heterogeneous surfaces is employed in order to achieve the goal.

Universal primer

For plaster, this kind of soil works well on most surfaces. While it exhibits good adhesive properties overall, specialized compounds work more effectively. Ideal for bulk flooring, forming screeds, installing tiles, pasting wallpaper, and staining.

There are benefits to using a universal primer for wall plaster:

  • An increase in the time of operation when installing tiles or applying plaster to a substrate with a high degree of adhesion;
  • When pasting with wallpaper, the process of setting slows down;
  • Exhausting, strengthening the surface layer. Allows you to reduce the flow consumption by the linear meter.

Deep penetration

Primers for plaster are typically applied to walls that are already plastered or made of cellular concrete in order to reinforce the structure of a loose, porous surface. Usually, the foundation of a "deep" solution is a water-polymer composition, which creates new molecular connections as it evaporates.

One unique aspect is that it must be completely dried. For instance, a gypsum plaster primer can hold moisture for up to six hours. Furthermore, skilled artisans advise delaying further work until the following day. Applying more than two layers is not recommended because too many polymers will exacerbate the process of moisture absorption and reduce the clutch force.


This primer primer is designed for low-absorption surfaces. often created using mineral filler and acrylate water-dispersion resin as the base. It creates a rough, protective layer-film after it dries.

Common applications include floors, old painted bases, and concrete jumpers. This kind of wall plaster soil lets air through and has a water-repellent quality that lets you "breathe." These mixtures serve as excellent foundations for the gypsum or cement finishes that are applied later.

Plaster aluminum soil is a unique variety. It is designed only for wood.

Preparatory work

Wall preparation is necessary for every plaster primer. You’ll need a roller or spray, a brush, and a bath for a solution for your work. In order to remove imperfections, seal cracks, or remove the previous coating, the surface must be machined before the composition is applied.

For instance, several extra procedures need to be carried out prior to priming concrete walls before plastering:

  • Scraping;
  • Grinding. Precedes the painting process, and also allows you to remove irregularities;
  • Putty. Required for damage, common in large area;
  • Sealing cracks and deep scratches;
  • "Church" alignment.


Typical wall preparation prior to plastering ready surfaces for two kinds of finishes:

    Staining. It is advisable to remove all layers of old paint, clean and moster from the front side. Sometimes alignment may be required – for this there are special putty. To make it good to paint, it makes sense to choose a special color soil;

A surface that has been properly prepped will enable the finishing layer to have the required strength and produce the greatest evenness.

A primer mixture

There are two important factors to take into account when selecting which primer to apply to the walls before plaster:

  • Surface type. "Waking" structures are recommended to plastering with a deep penetration soil. The base with a slightly sprinkling surface can be treated with the so -called concrete contact. In other cases, standard universal impregnation is selected;
  • Special properties. Sometimes, which primer is better for walls for plaster or painting will determine its specifics. There are mixtures with anti -corrosion additives, with an antifungal effect or insulating, for rooms with high humidity. In addition, combined soils-varnishes or soil-paints can be useful.


The force that the decorative layer has with the substrate is often determined by the primer used in plaster and wall materials. It’s important to consider this as well:

  • Cement, concrete (or analogue). Soil with a mineral base;
  • DSP, fiberboard. Alkyd compositions – what the walls before plaster will be the best option;
  • Glossy surfaces, synthetic paint. Acrylic soil will be the best choice;
  • Gypsum plate. You will need mixtures with high penetrating ability.

The force that the decorative layer has with the substrate is often determined by the primer used in plaster and wall materials.

The process of applying the primer

Prior to plastering, prime the walls. It should be noted that the standard work procedure consists of a minimal set of steps and may vary depending on the circumstances.

  1. Mechanical preparation. Wallpaper, nails, fasteners are removed and the old finish is removed.
  2. Alignment. It is necessary to remove all cracks, chips and protrusions. Before treating the walls before plaster, you should wait for its complete drying.
  3. Application of the first layer.
  4. Drying.
  5. Application of the second layer. A mandatory stage that allows you to smooth out the heterogeneity of the material and achieve uniform distribution of the composition.

In order to achieve uniform distribution of the composition and smooth out the heterogeneity of the material, application of the second layer is a necessary step.

The most common errors in priming

The cumulative bad experience must be considered in order for the plaster primer to produce the desired outcome, and you must not permit it to show up in your work:

  • Refusal to carry out the preparatory stage;
  • Non -compliance with drying deadlines;
  • Incorrect preparation. Before applying, impregnation for walls for plaster (concentrate) should be divorced in accordance with the instructions;
  • Excessive layers;
  • Suppies;
  • Using a chipped mixture.

It is necessary to divorce the impregnation of walls for plaster (concentrate) according to the instructions before applying.

It is impossible to perform a full repair without following all the required steps. This should be understood by both the client and the builders. As a result, the plaster primer is essential to the overall quality of the job since it lays the groundwork for the necessary level of comfort and coziness in the home.

Selecting an appropriate wall primer prior to plastering is essential to attain a seamless, long-lasting surface. Primers act as the base, ensuring that the plaster sticks firmly and doesn’t crumble. You can steer clear of common problems like peeling, cracking, and uneven surfaces by choosing the right primer.

There are various primer kinds that are appropriate for different wall types. A bonding primer is usually the best option for freshly painted, untreated walls. This kind of primer strengthens the plaster’s adhesion by offering a solid foundation. A stain-blocking primer helps produce a clean, uniform surface for walls with stains or discolorations by stopping any imperfections from seeping through the plaster.

A high-build primer can help smooth out small imperfections and provide a level surface for plastering on older or previously painted walls. A moisture-resistant primer is necessary to safeguard the wall and guarantee the longevity of the plaster in situations where mildew or moisture are concerns.

In the end, the primer you use will determine how well your plastering project turns out. A perfect, long-lasting finish is the result of taking the time to evaluate the state of your walls and selecting the appropriate primer. Purchasing a high-quality primer not only simplifies the plastering process but also improves the walls’ general appearance and durability.

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Daria Yakovlev

Interior designer, author of online color design courses. I will help you create a harmonious interior using color.

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