Finishing plaster: types and features of application

Finishing plaster: types and features of application

Painting walls and applying other coatings on them requires special preparation (alignment, elimination of defects). Often a plaster composition is used for this purpose. But the finishing plaster deserves special consideration, it is she who completes the preparation for the final finishing. In addition, sometimes such formulations can act as a finishing coat. In any case, you need to know the key features of using finishing plasters, at least for confident control of the work of specialists..

Peculiarities

Preparing plastered surfaces for gluing various boards and wallpapers was initially the most time consuming and very important step. But experience shows that with due diligence, it is quite possible to do all the work properly, without even turning to professionals.. Finishing is a type of surface that allows you to:

  • paint the walls;
  • cover them with whitewash;
  • use liquid wallpaper.

If you immediately start finishing on the ground and the bulk of the plaster, its shrinkage and significant grain size will not give a good result. This is not surprising; you might as well try to glue the wallpaper to medium-grain sandpaper. Curvature and unevenness of the walls will invariably be found.

The final plaster creates an almost perfectly flat background, especially when using long-nap paint rollers.

other methods

Finishing plastering, it should be noted, has alternatives. This is the application of multiple coats of primer to the least successful parts of the coating. Also, manually cutting off protruding places using sandpaper. This method helps if the adjustment was not made when leveling the main plaster layer. The problem is that even with careful execution of each operation, there may still be uneven shrinkage or lifting, deviations from the geometry may occur.. Therefore, final plastering is a must..

Composition

If you can devote many hours (days) to wall processing, and there is an intention to try your creative talents, you can try to choose the finishing plaster mixture yourself. It is selected by varying the proportions:

  • sand from quartz rocks (well sifted and always the smallest fraction);
  • binder Portland cement M400;
  • PVA glue (there should be very little of it).

But it should be borne in mind that such combinations allow you to get only even and maximally smooth surfaces, mainly protruding as a lining for a more perfect finish. If the task is to achieve an original appearance, special fillers are used.

    The opalescence effect and marble pattern are formed due to the introduction of ground glass, calcite dust, and all kinds of pigments. When there is already a company that you can trust, you should buy ready-made finishing or superfinishing compounds from it, as well as the required amount of acrylic-based primer. Such a step will definitely be more reliable than spontaneous experiments. Even experienced DIYers cannot achieve the same success as trained technologists..

    Application of the composition

    It is quite possible to apply a finishing material to the dried and partially hardened mass of the main plaster. But before that, you definitely need to check with the rule. Yes, such a tool has been used for a very long time in painting and decorating crafts – and yet it is more reliable, more practical than anything that engineers subsequently created. There is no need to use a marker to mark areas that raise certain questions – any pencil is enough.

    The largest hills are carefully removed with not too sharp tools or medium-grain emery; after such manipulation, an additional check is required.

    The edges of the deepest depressions and the most curved fragments of the wall are marked, then applied over an acrylic-based composition. The gross mistake is cutting off significant parts of the main plaster with trowel blades or steel rulers. Such advice is given by lay masters who follow the path of least resistance. The only result of such efforts is the ugly appearance of cracked material..

    Working with certain types of mixtures

    The finishing plaster for painting or for wallpaper is smeared on the walls with an even thin layer (0.2–0.5 cm), then it is additionally ironed with a trowel. If not a smooth material is used, but a “bark beetle”, initially they work with a small area (approximately 1 sq. M, with visual accuracy), on which the desired relief is achieved. The first tool in this case is a trowel. For the final shaping, it is advisable to take a plastic construction trowel. All such manipulations are done with your own hands easily and confidently, you just need to know the process and not be afraid.

    If the task is to imitate the appearance of fabric, natural stone or some other materials, there is no need to think of completing the work in one go. It necessarily breaks down into two complementary operations.

    First, the mixture covers the wall and the relief is created using the tools. After that, the coating is dried in a natural way without strengthening with hair dryers and other devices for exactly one day. Then they take up the second layer, which necessarily has a different color from the first..

    When working with Venetian plasters, there can be from 2 to 4 working methods, this is determined by the exact type of mixture and the target effects. First, the mass is distributed along the walls, and this should be done with short strokes, smoothly. As soon as 120 minutes have passed, the composition should be stretched and its relief should be formed. Next, they work with the second layer, which is also pulled out, achieving translucency of the base.. When the required number of manipulations has been done, the wall should dry for 24 hours.

    A standard bag of “Prospectors” with careful use is enough for 20 m²; As for the weaknesses of the coating, the most important of them is associated with a low viability after preparation. As a result, you will either have to do a little bit of work, or form a large team. Finishing KR is a polymer mixture, typical tare weight ranges from 3 to 20 kg, so it is not difficult to choose the optimal portion for solving a specific task.

    As in the previous case, everything that is prepared will have to either be applied immediately or thrown into a landfill. Cover 1 sq. m of surface can be 500-2500 g of the mixture, the exact value is determined by the thickness of the layers.

    It does not matter whether it is decided to replace the factory composition with a self-made one or not – the principles of work remain unchanged.

    You will definitely need spatulas of all sizes (for fine and rough work), as well as a special spatula for manipulating corners. The composition is mixed with a drill with a special nozzle, and the geometry of the coating is checked with building levels. You cannot do without rags that are unnecessary in the household (they wash the mixture that has fallen into places that are not suitable for finishing) and sandpaper (to correct errors). Important: if before work, slightly moisten the walls with water using the same rags, adhesion will increase, and dust content will decrease..

    When working with walls where drywall, concrete blocks, or with a brick base are used, applying the mixture from the bottom up is the most practical solution. It is recommended to hold the tool at an acute angle to the plane of the wall and do not pull it off. This approach guarantees a flat surface.

    When the wall is completely dry, it is rubbed and textured. This completes the work with factory or artisanal finishing plaster..

    In the video below, see the process of applying the finishing plaster..

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