Primer for decorative plaster - varieties
Priming the wall surface is a mandatory work process when carrying out finishing work. Let's try to figure out how important it is to use a primer for decorative plaster, and whether it is so important. You will also learn about the types of compositions, properties and features of the choice.
Do you need to prime? Plaster, which is used for wall decoration, often begins to crack and flake off the work surface during use. This problem can be solved by choosing the right components and providing the coatings with the required drying conditions.
But the degree of adhesion will directly depend on the preliminary preparation of the base. It will be interesting to form a microscopic crystal lattice when the primer dries.
It is due to it that the adhesion of the base and the used plastering agent increases. People who know little about this may think that using a primer is a publicity stunt and nothing more. In fact, with the advent of such a composition, the qualities of the finished surfaces have improved.
Regardless of the type of plaster, it does not give such an excellent result without the use of a primer. Finishing mixtures have also changed - trademarks offer huge lines of products for obtaining an ideal and high-quality result of work.
Note that it is often the same company that makes roughing, priming, and finishing plastering products to get a great finish.
The primer is a material on different bases, which can be liquid (in the form of a ready-made mixture) or in the form of a powder (requires dilution). In finished form, the compositions are viscous and resemble milk, and depending on the type, they can be with different shades or even colorless.
For rough finishing works, transparent compositions are used, and certain types of products are grayish and pinkish. If the finish provides for decorative compositions, use a white mixture. This will not distort the color of the finish, and it will be even better to see where the primer is. The material is sold in plastic bags and buckets. The amount of funds varies and depends on the processing area.
Powder formulations are easier to store, and when applied, overspending is reduced.
The composition for the treatment of walls is a means for the preliminary preparation of bases. It is used to keep the plaster on the base as long as possible. If it hits the wall structure, it binds microscopic cracks and dust. Depending on the variety, it can make porous walls uniform, even if they were built in violation of technology.
This is extremely important, because sand pours from such walls. For this reason, plastering can be a problem.It usually doesn't hold on to the ground for more than a couple of years. Flaking often occurs in the first year after finishing work. In certain cases, the primer can penetrate into the base structure to a depth of several cm.
In addition to strengthening the treated surface, they relieve the metal base from the corrosion process.
The wide assortment of primers is not accidental at all. This is not a single composition that differs only by the manufacturer. In fact, each type of primer for wall treatment before the plastering process differs in properties, and also in penetrating ability. The composition may contain different components, and therefore the degree of impact on the base is different.
Consider the main types of primers.
For work inside
A primer before applying decorative plaster is just for interior work. Most often, such formulations do not have a specific aroma, and there are three types of formulations:
- Concrete contact.
Consider the features of all types.
It is not recommended to use this composition on a metal or wood base. Formulations may have a resinous flavor. It is the most popular type of plaster used before plastering. It especially strengthens the top layer of the base.
This primer differs in that it contains quartz sand. Due to this, after drying, the surface will become rough to the touch. Such a composition is used on a base with old paint, on tiles and concrete. Since the old coating does not promote good bonding due to its smoothness and evenness, the task of the primer will be to create the required base for the plaster to cling to. It can also be used for weakly absorbent walls.
It is a suspension of small grains of sand in a sticky mass of pink tint. The grille obtained on the surface resembles sandpaper, and it is also quite rough.
The composition is sold in the form of a powder and a mixture that should be diluted at room temperature to the required consistency. The mixing ratio is indicated on the package. This primer is considered one of the best. It is often used on surfaces with a low water absorption coefficient.Acrylic compositions can be made into several types, and depending on the type of surface to be treated, they are adhesive, with deep penetration, special or impregnating.
Each type has its own properties and features, for example, impregnating primers are used where the base has a different absorption force in different parts of the surface. Its use makes it possible to equalize the absorption rate, and this is important for the further application of the plaster. No less remarkable is the composition that can destroy parasites.
But adhesives increase the strength of adhesion between the topcoat and the substrate.
For work outside
For external work, organic soluble agents are used.
These are primers that are resistant to weathering, high levels of pollution, parasites and bacteria. They are very different from compositions for interior work. This includes an acrylic compound for external processing. Compositions for external work contain fungicides and antiseptics, as well as water repellents. They are not afraid of temperature drop or radiation from the sun, as the mixtures are insulating, textured and antiseptic.
They are used with poor adhesion, under the plaster layer and after applying the finishing layer, if it begins to crack or peel off. According to the type of base, compositions are selected for cellular, smooth bases and concrete contact.
The properties of the primer for decorative plaster may differ depending on the type of material. The main task is to strengthen the base, and at the same time it perfectly prepares the base for plaster, for example, concrete, aerated concrete, bricks, polystyrene, gypsum and wooden surfaces, as well as cement and expanded clay. It is due to it that decorative plaster can be applied at a professional level.
The product contains film-forming components, fillers and resins. In most cases, it can be painted, and this property makes it possible to see where the surfaces have already been processed. This criterion is really important - the crystal film lattice should be uniform. Mineral mixtures contain gypsum, cement and lime.
Advantages of the primer:
- It is an antibacterial type of composition (prevents fungal colonies and mold from developing).
- Excludes the possibility of excess moisture getting to the base.
- Masks the base, evens out color and increases strength.
- Depending on the composition, it evens out the walls a little.
- Helps improve fire resistance.
- Hides stains on the treated surface.
In addition, the use of a primer makes it possible to reduce the consumption of plaster. Even the absorbency of the walls matters - after priming the plaster will not absorb much. This will make it possible to complete any patterns, if they are conceived according to the project plan.And on a primed surface it is much easier to work with plaster - it will lie flat, and this will reduce the time for finishing work.
Since it is problematic to thoroughly study information about primers in hardware stores, several features of the choice should be taken into account.
In addition, it is imperative to check the expiration date - if it comes to an end, then you should not take the material. But if the volume is small, and you are planning repair work in the near future, then you can buy the composition. After the expiration date, the operational and quality characteristics of the product change. Experts advise choosing a whole range of products from a single manufacturer for plastering at once.
Depending on the type of substrate and the amount of work carried out, the tools used to apply the primer sometimes differ.
Some people find it easier to use a roller, a broomstick, while others like brushes. It is best to use a flat brush and paint roller, and before applying the composition, you should pour it into a special container. Next, take a roller, saturate it with a primer, squeeze out a little and distribute the product over the surface. In this case, it is extremely important that the liquid does not flow from the roller - this way the consumption will turn out to be unjustified (the liquid will begin to flow along the walls to the floor, which is undesirable).
The brush is used at the junction of the walls and ceiling, as well as in the corners, in order to fill the surface with the composition to the maximum.
The brush makes it possible to carry out the work as accurately and efficiently as possible. It is not required to prepare the surface for external plastering. But not everything is so simple - first you need to prepare the base, and for this it is worth removing the bumps on the surface, masking the potholes, chips, cracks.Usually putty is used for this, and everything that crumbles is removed. The primer is applied by dividing the walls into two parts - the bottom and the top, and first of all, it is the upper part of the plane that should be processed.
It is required to apply the composition in two layers, and the second cannot be applied until the first is dry. It is extremely important not to break the grate, which is not completely formed on the surface to be treated. If the subfloor is too smooth, or fiberglass mesh can sometimes be used while preparing the foam. It should not be very dense, as this can complicate the process.
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