SUBSTRATE PREPARATIONThe substrate must comply with the requirements of SP 71.13330.2017.
Concrete, reinforced concrete, cellular concrete – age over 3 months and relative humidity not more than 4%;
Cement-sand, cement-lime plasters – age 28 days and relative humidity not more than 4%;
BERGAUF ISOFIX, BAU PUTZ ZEMENT, UNTER BAU, GLATTE ZEMENT, FINISH ZEMENT – age over 3 days and relative humidity not more than 6%;
Sheet gypsum-, cement-, wood-containing materials, as well as gypsum plasters – thickness not less than 10 mm, relative humidity not more than 1%.
To achieve an ideal decorative effect, the deviation of the substrate flatness when checked with a two-meter straightedge should not exceed the size of the fraction used in the product.
Before application, clean the surface of dirt and dust, peeling old coatings, and oil stains – everything that can impair the adhesion of the material to the substrate. Damaged old coatings must be removed. It is recommended to fill large cracks with a plastering compound (for example, BERGAUF BAU PUTZ ZEMENT) 24 hours before the main plastering. Sheet materials must be firmly fixed with an increased fastening coefficient of 1.2.
To improve adhesion, reduce gaps, and enhance the quality of the decorative plaster pattern, pre-treat the surface with Bergauf TechnoPrimer and/or Bergauf Techno Primer Paint and let it dry for 4 hours. If necessary, the primer-paint should be tinted to the color of the subsequent coating.
WORK PROCEDUREBefore application, the plaster must be thoroughly mixed, as product separation may occur during storage. Dilution of the plaster with water is permitted in an amount not exceeding 5% of the material weight.
Apply the plaster with a trowel, spatula, structural roller, or other tools that allow for the creation of the desired decorative effects. After complete drying, the coating can be polished to a high gloss using a spatula or trowel. To achieve a higher gloss, a grinding machine and/or a protective wax emulsion can be used; for additional surface tinting, use a glazing compound.
To create the "Map of the World" effect, use rollers with a pile of 12-15 mm, a metal spatula, and a Venetian trowel/plastering trowel.
Application is recommended in 3 stages:
1. Load the roller generously with material and apply it to the substrate in a 2 mm layer. Then, distribute the material evenly over the surface. 2. Use the same roller to create a "Shagreen" relief by moving it up and down several times. Wait for complete drying - 24 hours.
3. After the "Shagreen" relief has dried, apply the material generously to the entire surface of the trowel using a spatula, and use patting motions on the trowel surface to form shagreen-like peaks. Next, stamp the trowel with the shagreen onto the first layer of the "Shagreen" relief, remove excess material from the trowel with a spatula, and use the edge of the trowel at a 40-degree angle to level the material with chaotic movements, creating a "Map of the World" pattern with smoothed islands and shagreen between them. Repeat the movements until the entire area is covered. Wait for complete drying - 24 hours.
If large burrs remain on the surface after complete drying and interfere with the tactile feel, they can be treated with sandpaper with an abrasive no coarser than 180P. Next, it is mandatory to coat the surface with a protective varnish for water-dispersion coatings to protect the finish after sanding. After the varnish dries, the surface will level out into a uniform color.
If it is necessary to stop work, apply masking tape along the boundary of the plaster layer, which must be removed before the plaster hardens.
At ambient temperatures below +20°C and relative air humidity above 60%, the decorative plaster should be protected from direct sunlight, wind, and rain for the first 3 days after application. Under such conditions, it is recommended to cover scaffolding with a special mesh or film and install water drains on the building. Do not allow freezing or overdrying.
Interior finishing should only be performed in well-ventilated rooms, and after completion of work, air circulation should be maintained until the coating is completely dry.
Clean tools with water immediately after work. If the tools were not cleaned immediately, they can only be cleaned mechanically later.
It is forbidden to work during precipitation, fog, as well as on wet surfaces after rain and at temperatures below +5°C and above +30°C.
SAFETY PRECAUTIONSWork should be performed using personal protective equipment for hands, eyes, and respiratory tract. Use in well-ventilated areas.