Work With Primers

How many primers per square meter is needed?

In many cases, before the final color finish of the surface it must be primed. For such purposes, you can use the main paint, but this is in most cases irrational. After all, a more expensive component of the coating is consumed and the main target is not solved - preparation of the surface for painting. How to calculate the consumption of the primer and how much it should be purchased?

Contents:
  • Why priming is required at all
  • Types of primers and their application
  • How to calculate the need for
  • Specific consumption of different primer formulations

Why do you need priming

The fundamental difference between a paint and a primer is that the final color solution of the treated surface is created by painting, andpriming ensures the quality of this process. Thus, a primer is necessary in order that the subsequent layer of paint does not lag behind the time from the original surface.

Rarely when the paint layer is dense and monolithic. Exceptions are metals, as well as some( a very limited number) of plastics and composites. All other materials - concrete, wood, plaster - are porous in one way or another. Direct painting of such materials leads only to over-consumption of paint. The durability of such a coating on the walls also leaves much to be desired: in due course it lushes and lags behind.

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Advantages of the

primer In such cases, they prefer to blame the paint, although it has nothing to do with it. The reason is different - no qualitative preparation for staining was carried out. And this is not only cleaning the walls from traces of dirt, dust, fat, but filling all available pores. It is the last function to perform various priming compositions.

The second, no less important, task of priming is to increase the strength of the initial surface in subsequent work with it. Both plaster and putty - the materials are very fragile: they can easily be dyed out under various mechanical influences. Over time, their strength is further reduced. Therefore, the primer is also intended for the qualitative binding of various components of the finishing compounds to each other.

Finally, a primer is necessary in order to protect the surface from harmful external influences, for example, from fungi, rotting, etc. The paint usually does not contain the components of protection against mold - it has a different task. But priming compositions, not striking in terms of color and expressiveness, just provide the necessary resistance to increased humidity, temperature fluctuations.

Kinds of primers and features of their use

According to the type and technological characteristics of the surface to be treated, these types of polymer primers are distinguished:

  1. Alkyd, intended primarily for preparation for painting wood, including the facades of wooden houses. Sometimes they are also used for metal surfaces. Since alkyd resins are included in such primers, it is not recommended to use another type of paint in the future. Do not apply such primers to plaster or gypsum surfaces. Not recommended for internal work, because they are quite toxic.
  2. Epoxy, which is treated with ordinary steel, tin, chemically resistant plastic. Such primers provide the most effective adhesion of epoxy paint to the surface, but they completely fill all the pores in the starting material, therefore they are suitable only for the treatment of inorganics, which practically does not react to changes in external conditions. The treatment of pipes, facades of houses is the most expedient application of epoxy primer.
  3. Acrylic, which are considered the most versatile. They are ideal for all types of paints and original surfaces, both internal and external. Metal, bitumen compositions, plaster are perfectly suited to priming with such materials. Even more effective is the acrylic primer of deep penetration, which is recommended for facade elements of buildings. However, it is not advisable to primethe metal with such compositions, since they do not contain anticorrosive constituents.
Types of primer mix

The principle feature of all primer compositions is that they show their maximum efficiency only when the surface is subsequently treated with paint of the same composition. This is not surprising, since the main component of both types of coverage is the same, and therefore the coupling is expected to be of higher quality.

The composition of any primer also includes a number of auxiliary substances: fillers, adhesives, resins, neutral coloring pigments, sometimes - oils.

How to calculate the need for

The need for a primer is found out the same way as for paint. Worse, when it is not enough, but for this you can not reduce the intensity of priming: deterioration in the quality of this operation will lead to the fragility of the painted coating( especially for textured, quartz putties), which ultimately results in unnecessary financial costs.

Primer application chart

Primer consumption per 1 m2 of surface is the main way of finding out the need for this coating. In this case, the type of the primed surface is of decisive importance. For example, the consumption of a deep penetration material is higher than that of a conventional one, but, in the final analysis, the adhesion to the paint increases noticeably. Given that the price of the primer is lower than that of paint, the resulting household benefits are obvious.

Manufacturers of primers usually indicate the specific consumption of the formulation on the package. But these values ​​are indicative and depend on the specific conditions of work with this composition, including the external values ​​of temperature and humidity. For example, it is not possible to prime the facade surfaces at temperatures below 5-10 ° C, and priming of rooms with high humidity( in particular, bathrooms) is possible, but does not guarantee the nominal performance of the glue, which will subsequently be glued to the walls with ceramic tiles.

Primer consumption table

Thus, the calculation of the requirement for the primer depends on:

  • the configuration of the surface to be primed( with its increasing consumption, the flow rate increases);
  • specific composition and purpose of the primer;
  • composition of the original surface;
  • after processing;
  • external temperature and humidity conditions( especially important for work on the facades of houses);
  • method for applying primer to plaster, polymeric materials, pipes and other surfaces.

In the future, all recommendations regarding such a parameter as the priming consumption per 1 sq. M., Will be considered with regard to the technology of priming manually. With a mechanized application, the specific consumption will increase by 10-15%.

Specific consumption of different primer compositions

The rate of application for alkyd primer compositions is 60-100 g / m².For old wooden surfaces of facades take maximum data of specific consumption.

The most popular primer is a deep penetration. It is much more economical than alkyd compounds and is not critical to the initial characteristics of internal coatings: the degree of their porosity, thickness, the presence / absence of plaster and other points.

Primer Consumption Concrete contact

The priming depth of the deep penetration varies from 75-180 g / m².Such a significant spread is explained by the type of material to be primed. The maximum values ​​correspond to brick, wood, bituminous mastics, plaster. Minimum consumption is typical for metals that have been pre-cleaned from rust, dirt( for example, when processing various pipes, finned surfaces of heating radiators).The rate of consumption when working with epoxy primer in these cases is much less - up to 100 g / m².

Consumption of primer concretecontact has its own characteristics. Such compositions are designed for the processing of internal surfaces with low initial porosity, as well as with high roughness( for example, coated with quartz plaster). As this primer dries quickly, its specific consumption increases.

Another reason for the increased quantity is the need to create a good adhesion of the treated surface with paint, bitumen mastic or glue for tiles. Therefore, acceptable values ​​for concrete coatings are considered to be 250-400 g / m².

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