Silicone decorative plaster: features and application

Decorative silicone plaster has gained popularity among professionals and homeowners because of its special qualities and wide range of uses. This kind of plaster not only makes walls look better, but it also provides durable defense against the elements.

The flexibility and durability of silicone-based plasters set them apart from traditional plasters, enabling them to be used both indoors and outdoors. They are also commended for their breathability, which prolongs the surface’s life by preventing moisture buildup.

This post will discuss silicone decorative plaster’s key characteristics, advantages, and application techniques for a smooth, appealing finish.

Technical characteristics and composition

Organic resins are added to create decorative finishing material on a water basis. During polymerization, these resins form an elastic structure. Acrylic or liquid glass are also used as components in complex compositions. To speed up the drying process, additives are added that enhance adhesion and boost hiding power. Small pebbles or quartz, or river sand, are natural mineral fillers that are required to give texture to the plaster mixture.

• density, this indicator depends on the amount of filler, varies from 1.6 to 1.86 kg / dm3;
• grain size from 1.5 to 3 mm;
• average setting time within 15 minutes, complete drying requires up to 14 days;
• moisture resistance is formed after 24-48 hours (the silicone base, which has water-repellent properties, is polymerized);
• frost resistance is specified for facade plaster, at least 100 freeze/thaw cycles (F100);
• service life of at least 25 years.

Manufacturers create coating modifications for both interior and exterior projects. Their plaster product line includes varieties that can be used in temperatures between -50 °C and +70 °C. Blends are prepared for use when the ambient temperature rises from +5 °C to +30 °C. It is not permitted to form a layer in the rain, strong winds, or direct sunlight.

Varieties

Based on the kind of base, decorative silicone plaster mixes are separated into three major categories:

• silicate-silicone with the addition of potassium liquid glass – an ideal plaster for the facade, not prone to cracking with a sharp temperature drop;
• acrylic-silicone with the addition of acrylic resins;
• siloxane (Venetian) for interior decoration with thermoplastic silicone translucent filler.

The effects of mixtures for internal and external works vary:

• bark beetle with pebbles, when applied forming grooves, the layer imitates wood eaten by beetles, the final appearance of the surface depends on the size of the inclusions;
• lamb – mosaic quartz filler forms a granular structure of the decorative coating, resembles fleece when dry;
• fur coat or pebble can be with marble or granite chips
• Venetian creates the effect of marble finishing, intended for interior decoration of walls in houses and public buildings.

Shiny additives, such as mother-of-pearl plaster, bronze, or aluminum powder, can also add decoration.

On what walls can silicone decorative plaster be used

Nearly all mineral bases—such as brick and block masonry, foam concrete, and other lightweight concrete—ensure good adhesion. Additionally, silicone plaster is used:

• on wood of different densities;
• plywood;
• wood-fiberboards;
• drywall;
• leveling plaster;
• mesh or fabric, reinforcing roll or sheet insulation.

Decorative finishing "breathes," holds heat well, and fortifies a wall that is weak.

Not advised for extremely smooth cement, metal, or painted surfaces; it does not cling well to oil or varnish paint.

Technique for applying silicone decorative plaster

Similar to leveling mortars, both manual and mechanical techniques are employed in this technology. The following are the usual requirements for completing the work:

• not very high positive temperature;
• no drafts;
• protection from direct sunlight.

Fall or spring plastering is common for facades.

For the final plastering, the surface to be treated is first prepared. Working in a team is preferable when completing a lot of work. It is important to consider that open mixtures only last for two to three hours before losing their effectiveness; plaster that has been overexposed cannot be used, and the layer’s quality will deteriorate. Prior to work, premade compositions are thoroughly mixed until a homogenous structure is reached. Water can be added if needed, but no more than 10% of the initial volume.

Surface preparation

Keep the base from collapsing. Remove the previous layer of plaster if needed. Leveling the walls and caulking small cracks are not necessary if medium- and coarse-grained compositions are used. The bases have to be absolutely flat before applying Venetian silicone plaster.

The room and the facade should be free of any dust or small debris. Cement suspension should be blown off. The purpose of priming is to improve adhesion. The mineral base is strengthened and less silicone plaster is used when the primer is applied. The base has to be thoroughly dried before applying the finishing mortar.

Masonry joints in newly constructed buildings are sealed, and building mixtures are used for initial leveling and plastering. Next, move on to the walls’ last finishing. Old paints and varnishes are stripped down to the base, the wallpaper is torn off, and the insulation is pre-reinforced with fiberglass or polymer mesh. To stop the completed finish from peeling, old plaster is tapped.

Tool

To combine the ingredients, a mixer is required. Trowels and floats should be ready. Using a roller or metal/plastic spatula, the solution is applied. Spraying creates a textured layer that is formed with brooms and wash brushes.

It is necessary to use a cartridge gun (hopper) if the solution is applied mechanically. To prevent mixture fragments from drying out and scratching the layer of decorative plaster being applied, the staple and roller planes are frequently cleaned while the job is being done. Cleaning all accessories right away after work is advised because silicone polymerization causes issues.

Application

You have to wait for the first layer to completely dry before applying the next when using multiple layers. Starting from the wall’s corner, work is done vertically. Before a newly laid layer solidifies, it needs to be leveled. Put a strip of masking tape along the finished edge of the wall if processing the entire wall is not feasible to keep fresh mortar out. The speed of plastering increases and the texture gets "fluffy" with mechanized spraying. Keep the hopper nozzle and the wall you’re processing at an even distance.

Is it possible to paint (tint) silicone plaster, and with what paint

Plaster compositions are typically provided in a standard white hue. There are two methods to achieve the desired shade:

• add a colorant for water-based paints and varnishes, you can get colored coatings and metallic shades of bronze, silver, gold, achieve a pearlescent shine;
• paint the dried top layer with acrylic or other types of paints and varnishes.

Additionally, you can use water-based paints and coloring pastes. Opt for UV-resistant dyes when choosing colors for facades.

Safety precautions when working

When finishing a ceiling, plasterers wear specific clothing and wear safety gear, especially when working on horses. Wearing a respirator to protect the respiratory system and tightly fitting glasses to shield the eyes from splashes are essential when using machinery. General safety guidelines ought to be observed:

• de-energize the premises;
• check the reliability of scaffolding and platforms during facade processing;
• have the necessary tools at hand when working with alkaline and acidic mixtures (acid is neutralized with a 0.5% soda solution, alkali – 1% acid);

• ensure compliance with the water-drinking balance;
• have a supply of clean water for emergency rinsing of mucous membranes.

Wearing gloves to shield the hands’ skin is optional because the mixtures don’t burn.

Due to its strength, flexibility, and ability to withstand weather and dirt, silicone decorative plaster is a popular material for both interior and external walls. It offers an extensive array of textures and colors, is simple to apply, and produces a breathable finish. Whether you want a more textured surface or a sleek, elegant appearance, this plaster can accommodate different design requirements with little upkeep.

Care of silicone plaster

Because processed facades are dielectric, dust does not stick to them. Its hydrophobic qualities prevent dirt from entering the pores. It suffices to use a hose to wash the walls if a layer has formed on the facade from vehicle splashes.

Homemade cleaning solutions can be used to clean decorative silicone plaster inside.

Selecting hypoallergenic detergents for cleaning glossy surfaces or upholstered furniture is advised.

Consumption

The mixture’s required volume is computed using the indicators listed on the label. Depending on the grain size, the compositions’ respective consumption ranges from 2.1 to 5.0 kg/m². There is less "Venetian" consumption.

Plaster is used more sparingly when the layer is laid mechanically. When work is done poorly and on uneven surfaces, consumption rises. Since novices produce more waste that is not productive, it is necessary to set aside a small reserve.

Feature	Description
Water Resistance	Silicone plaster is highly water-resistant, making it suitable for exterior walls.
Flexibility	Maintains elasticity even under temperature changes, preventing cracks.
Self-Cleaning	The surface naturally repels dirt and dust, requiring less maintenance.
UV Resistance	Offers excellent protection against fading and weathering from sunlight.
Application Method	Can be applied by hand or using a spray gun for a textured finish.
Durability	Long-lasting performance with minimal upkeep, ideal for both residential and commercial buildings.

One adaptable option that blends durability and beauty is silicone decorative plaster. It is a recommended option for both indoor and outdoor applications due to its adaptability, resilience to weather, and self-cleaning qualities.

While silicone plaster is easy to apply, a smooth, long-lasting finish is ensured by careful surface preparation and technique. This material gives you a variety of options to improve your walls, whether your goal is a sleek or textured look.

Silicone plaster is a wise investment for any house or construction project because, with the correct upkeep and care, it can last for years.

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