Winter creates the harshest testing environment for exterior facade coatings. The combined effects of low temperatures, freeze-thaw cycles, high humidity, and UV rays threaten the integrity and functionality of paint films. Under these conditions, selecting the right material is critical for protecting the building surface, maintaining aesthetics, and ensuring long-term cost efficiency.

Common Problems with Traditional Dispersion Paints in Winter Conditions

Cracking and Blistering of the Paint Coating

Traditional paints have a limited capacity to adapt to thermal expansion and contraction cycles. Binders that fracture and become plasticized over time due to UV rays become even more brittle in the cold, making them prone to cracking and delamination (blistering).

Surface Color Fading and Erosion

Organic pigments and binders undergo photochemical degradation when exposed to UV radiation. This leads to premature color fading and accelerated surface erosion.

Breathability Issues and Moisture Problems

The low vapor permeability layer created by traditional paints restricts moisture trapped inside the wall from escaping. In winter, high humidity can cause vapor to condense or freeze and expand within the structural elements. This results in the weakening of the underlying binder layer, performance loss of insulation materials, and the risk of mold growth.

Loss of Adhesion Strength

Freeze-thaw cycles place heavy stress on the adhesion bond between the paint and the substrate. Synthetic films that have lost their elasticity may partially or completely lose their ability to adhere under this stress.

Potassium Silicate Paints: The Definitive Solution with Soldalit

KEIM SOLDALIT utilizes a binder system consisting of potassium silicate and silica sol. This system chemically reacts (silicification) with the mineral substrates it is applied to (silicate plaster, concrete, natural stone), fusing at a microscopic level. The resulting bond is completely mineral and porous.

• Resistant to Thermal Movements: Thanks to the chemical bond, it is unaffected by thermal movements and does not show cracking or blistering.
• High UV Resistance and Color Retention: Since the material is entirely mineral, it exhibits high resistance to UV rays. Inorganic pigments ensure that colors retain their original vibrancy for decades.
• Easy Application: Sol-silicate technology is supplied as a ready-to-use mixture and can be applied directly. It also provides stable adhesion over old organic paint layers.

Breathable Structures

The micro-porous structure formed by KEIM Soldalit allows water vapor to escape freely. This feature is vital for maintaining the moisture balance of the building. Since moisture is not trapped inside the wall, freeze damage and moisture-related insulation failures are prevented. The structure “breathes” and regains a healthy moisture cycle.

In terms of longevity parameters, it offers a distinct performance difference compared to traditional paints. It provides protection for decades without requiring maintenance, repair, or renewal. This makes it not only an economical option in the long run but also represents a sustainable and resource-efficient approach.

Professional and Lasting Protection

In winter months and harsh climate conditions, exterior facade performance is directly related to the chemical and physical properties of the selected coating material. When used in conjunction with professional application, KEIM Soldalit provides a long-lasting and trouble-free exterior facade solution.

One of the biggest concerns in interior design is that meticulously selected colors lose their vibrancy and character by fading over time. KEIM Optil stands out as a revolutionary interior paint with "unmatched lightfastness" that eliminates this concern at its root.

Natural Formula Extending the Life of Colors

The fundamental secret behind KEIM Optil's non-fading colors is the mineral-based sol-silicate technology. Unlike traditional paints, color pigments do not just form a film layer on the surface; they integrate with the wall surface through a chemical bond (silicification).

This process ensures the colors become extremely resistant to UV rays, moisture, and physical factors. Instead of being encapsulated by a binder, color pigments reflect light directly within the crystal structure, offering unique depth.

Superior Protection with MacroFill Technology

The new generation "MacroFill Technology" not only perfectly balances the velvety matte texture and light reflections but also strengthens the color layer with a protective structure. This technology preserves the depth and homogeneity of the color tone while creating a barrier against external factors, maximizing color durability.

Even under challenging interior lighting conditions (under south-facing windows, spotlights, etc.), colors maintain their vibrancy and saturation just like the first day.

Extensive and Permanent Color Palette

KEIM Optil offers its non-fading feature with 16 fascinating monochrome color options and the richness of the KEIM Avantgarde color palette. From gold and silver tones to a tribute to the polychromatic scheme of the 1920s, each carries the same superior lightfastness standard.

This means designers and architects can create lasting visual integrity in long-term projects without compromising on color choices.

Full Compliance with Sustainability and Air Quality

Non-fading colors are not only an aesthetic advantage but also an economic and ecological one. It saves resources by postponing the need for renovation and refurbishment for many years. KEIM Optil's additive-free, ecological formula and high vapor diffusion resistance protect indoor air quality while providing durability against factors like moisture and alkali that can cause color degradation.

An Investment Against Time

KEIM Optil is more than a paint; it is a lasting aesthetic investment for your interiors.

With its non-fading colors and ultra-matte sophisticated finish, it creates an atmosphere in your spaces that feels as fresh and deep as the first day for years. While offering perfect coverage and ease of application for professional applicators, it promises the end-user a rare combination of visual perfection and building physics.

Winter offers the perfect opportunity to adorn our interiors and living spaces with warm, peaceful, and inviting colors. During these months when cold weather reigns outside, the inside and outside of our homes can be transformed into living spaces with tones that embrace us and soothe our souls. At this point, silicate paints—standing out with both their longevity and breathable structure—especially with the warm tones in the KEIM Exclusiv color palette suitable for the winter season, will warm your heart and add character to your spaces this winter.

Ivory | KEIM Exclusiv 9078: Timeless Elegance

KEIM Exclusiv 9078 Ivory is a soft and neutral color against the gloomy gray tones of winter. This shade makes spaces appear bright and spacious even in months with diminishing daylight. In interiors, especially in living rooms and corridors, it creates an expanding and calming effect. When used on facades, it exhibits a classic and noble stance while making your building sparkle even in the pale light of the winter sun. It harmonizes perfectly with materials like wood and natural stone, allowing you to blend warm and cool tones.

Latte | KEIM Exclusiv 9132: A Warm Embrace

KEIM Exclusiv 9132 Latte evokes warm coffee tones and is an intimate, inviting color that wraps around you like a blanket. This earthy tone will warm you up on winter evenings and is ideal for gathering areas such as dining rooms and kitchens. Encouraging social interaction, this color instills a sense of comfort and trust in interiors. In facade applications, it lends a warm and contemporary appearance, especially in harmony with the surrounding natural landscape.

Greige | KEIM Exclusiv 9574: Modern and Sophisticated Stance

KEIM Exclusiv 9574 Greige is the most elegant interpretation of the gray tones naturally present in winter. Not a cold gray, but a nuanced tone, it adds depth and sophistication. In interiors, it breathes life into modern and minimalist styles. It provides serenity and focus in personal spaces like study rooms and bedrooms. On facades, it offers an extremely stylish and contemporary expression. When combined with other winter colors, especially Ivory or Terracotta, it creates a dynamic and balanced visual composition.

Sage Green | KEIM Exclusiv 9410: The Tone of Serenity

Bringing nature's serenity into your home, KEIM Exclusiv 9410 Sage Green is one of the most peaceful colors of winter. This pale, grayish-green tone provides a sense of freshness and tranquility. It is perfect for relaxation areas like bathrooms and bedrooms; it reduces stress and creates a sense of balance. It harmonizes magnificently with natural textures, wicker, and wood in interiors. When used on the facade, it blends with the surrounding winter landscape, ensuring an organic and calm aesthetic.

Soft Terracotta | KEIM Exclusiv 9146: Vitality and Energy

For those wanting to add a vivid touch to winter, KEIM Exclusiv 9146 Soft Terracotta is indispensable. Inspired by the warm, reddish tones of the earth, this shade imparts energy and a lively character to spaces. When used as an accent wall in the living room, it creates a focal point. It offers a warm welcome in areas like entrance halls. On facades, it stands out with a bold and friendly expression, providing a warm and inviting look even in cold weather. It can create an impressive modern atmosphere when combined with natural stone and metals.

Healthy and Aesthetic Spaces

This winter, renew your spaces not only with a color but also with the human-friendly, breathable surfaces and long-lasting structure of KEIM Silicate Paints. Let these 5 shades from the KEIM Exclusiv chart inspire you to create a unique warmth and depth in your interiors specific to winter.

People spend the vast majority of their time indoors. Therefore, ensuring our living and working spaces are healthy, peaceful, and aesthetic is more important than ever. But how do we choose the right interior paint to achieve this balance? Going beyond traditional paints and representing a true investment for both your building and its inhabitants, KEIM Innotop Silicate Paint offers a definitive and convincing answer.

Breathable Walls: The Benefits of High Vapor Permeability

One of the most critical criteria for quality interior paint is vapor permeability. Unlike dispersion (plastic) paints, KEIM Innotop features a micro-porous structure that remains highly open to diffusion. This effectively allows your walls and the paint layer to "breathe."

Moisture is absorbed without hindrance and released back into the air depending on environmental conditions. This regulating property significantly reduces the risk of mold growth and helps create a healthy, balanced indoor climate. It provides optimal building physics, especially for humid areas and new constructions.

A Clean Choice for Your Health: No Harmful Substances

Our homes should be sanctuaries, not sources of anxiety. KEIM Innotop ensures this confidence with a formula free of solvents and plasticizers. With no concerns about long-term harmful emission releases (VOCs), you can create healthy spaces that are safe to inhabit immediately after the paint dries. This feature makes it ideal for children's rooms, bedrooms, and any environment occupied by sensitive individuals.

Maximum Safety: Non-Combustible and No Toxic Fumes

Safety is an inseparable part of comfort. Thanks to its pure mineral silicate binder, KEIM Innotop is non-combustible. In the event of a fire, the paint layer does not ignite and helps delay the spread of flames. More importantly, unlike plastic paints, it does not release toxic fumes or gases under high heat; this provides vital escape time and significantly increases life safety.

Natural and Timeless Aesthetics: Mineral Matte Appearance

Visual satisfaction is just as important as performance. KEIM Innotop offers a distinctively pleasant and natural mineral matte appearance. Its warm white tone and velvety matte surface add depth and a soothing calmness to spaces. Instead of a plastic sheen, it gives walls a genuine, tangible character.

Versatile and Durable Use

KEIM Innotop is suitable for use on all traditional mineral interior surfaces such as plaster, concrete, and drywall. It offers a wide range of applications, from living and working areas to humid environments like bathrooms and kitchens. Thanks to its durable structure, it maintains its beauty for years to come.

Absolute Mineral

KEIM Innotop is not just paint; it is a system that elevates the quality of your living spaces. For those seeking a healthy, safe, aesthetic, and environmentally conscious choice, it is the right decision for your renovation or new construction projects.

Concrete is one of the indispensable building materials of modern architecture. With its durability and aesthetic potential, it is frequently preferred in both interior and exterior spaces. However, over time, concrete surfaces can deteriorate due to weather conditions, moisture, pollution, and chemical effects. This is exactly where a smart solution steps in to preserve the unique character of concrete and protect it for many years: KEIM Concretal-W.

What is KEIM Concretal-W?

KEIM Concretal-W is a high-performance sol-silicate paint system developed specifically for concrete. Unlike traditional paints, it does not form a thick film layer on the surface; instead, it penetrates the pores of the concrete and forms chemical (covalent) bonds. This "crystalline binding" process makes peeling or blistering almost impossible and provides lifetime protection.

Why Choose KEIM Concretal-W?

• Natural and Mineral Matte Appearance: It completely preserves or emphasizes the raw, natural texture and aesthetics of concrete. It offers a noble mineral matte finish, not a plastic sheen.
• Breathable Protection: Thanks to its high vapor permeability, it allows the concrete to "breathe" while exhibiting excellent water repellency (hydrophobic) properties. Moisture cannot penetrate the structure, thus preventing efflorescence, mold, and algae growth.
• Exceptional Durability: Containing only lightfast inorganic pigments, the colors do not fade against UV rays. It is highly resistant to weather conditions, acid rain, and abrasion.
• Self-Cleaning & Low Maintenance: Thanks to its antistatic nature, dust and dirt accumulation is minimal. Rainwater easily washes away dirt from the surface, reducing maintenance costs.
• Eco-Friendly and Safe: It has zero VOC (Volatile Organic Compound) content. Produced with non-combustible (Class A) and non-toxic ingredients. It holds Cradle to Cradle Certified® credentials.
• High Alkali Resistance: It can be safely applied to fresh or old concrete surfaces with a pH value between 6-13.

Technical Specifications and Complementary Solutions

Designed for sustainable architecture, this system stands out with its ease of application and system integrity. The paint, which has a mineral matte gloss level (2.0 at 85°), can be applied by brush, roller, or airless spray. In a two-coat application on cast concrete, the average consumption is approximately 0.35 kg/m².

Powerful Components of the System:

KEIM offers holistic solutions for different surface needs:

• KEIM Concretal-W-Grob: A primer coat for rough, repaired, or difficult concrete surfaces. It closes hairline cracks and evens out the surface.
• KEIM Concretal-Fixativ: Used as a thinner and primer for system products; it balances surface absorption.

Conclusion: The Guardian of Concrete

For architects, contractors, and property owners, it offers maximum durability and minimum maintenance without disrupting the aesthetic integrity of concrete structures. For those seeking a sustainable, eco-friendly, and high-performance solution, KEIM Concretal-W is the pinnacle of concrete protection technology.

Absolute Concrete Aesthetics

Available in White and all shades in the KEIM Exclusiv color palette. Custom color matching is also available for your special projects.

Power generation facilities, especially thermal power plants, are industrial environments where the harshest conditions prevail for building materials. Extreme temperature differences between indoor and outdoor environments, the risk of corrosion caused by atmospheric carbon dioxide (CO2), and physical abrasion seriously threaten the lifespan of concrete structures. At this point, the protection of concrete surfaces becomes not just an aesthetic necessity, but a structural obligation.

At the Hamitabat Thermal Power Plant, which is exposed to the harsh and continuous winds of Thrace, KEIM Concretal-W High-Performance Sol-Silicate Concrete Paint was chosen as the most effective solution against these tough conditions.

What Makes KEIM Concretal-W So Special?

Unlike conventional paints, KEIM Concretal-W does not form a film layer on the concrete surface. Thanks to its Sol-Silicate technology, it penetrates deep into the pores of the concrete and establishes covalent crystalline bonds with the substrate. This means that the paint will never peel or blister, and will integrate completely with the concrete.

Critical Advantages Achieved in the Hamitabat Project

Here are the main benefits provided by this technology in the project:

• Resistance to Thermal Shocks: While standard paints crack as they cannot tolerate expansion and contraction in the face of the extreme temperature differences experienced in the power plant, KEIM Concretal-W moves together with the concrete thanks to its mineral structure. Thus, no cracking or spalling occurs on the surface.
• Superior Protection Against Chemical and Physical Abrasion: Abrasive particles carried by the severe winds of Thrace can erode unprotected concrete surfaces over time. The solid mineral surface created by Concretal-W shows high resistance against this mechanical abrasion.
• Carbonation Barrier: By creating an effective barrier against carbonation, one of the greatest enemies of concrete, it prevents the reinforcement inside from corroding.
• Breathable and Self-Cleaning Structure: KEIM Concretal-W allows the concrete to breathe thanks to its high vapor permeability. Moisture trapped inside does not build up pressure in the paint layer and does not cause blistering. In addition, thanks to its antistatic structure, the surface repels dirt.
• Sensitivity to Environment and Human Health: With zero VOC emissions, Class A non-combustibility certification, and international certifications such as Cradle to Cradle Certified® Silver, Concretal-W is a safe material that does not harm the environment.

Conclusion: Long-Lasting and Aesthetic Protection

The Hamitabat Thermal Power Plant example is the most concrete indicator of how the right material choice can extend the lifespan of a structure. While preserving the natural texture and matte aesthetics of the concrete, KEIM Concretal-W gives it the strength to stand securely even under the harshest industrial conditions.

Investing in the Future

If you want to carry concrete surfaces into the future in your projects, reduce maintenance costs, and achieve sustainable protection, discover this unique technology offered by KEIM Concretal-W.

In today's modern architecture, exposed concrete is not just a load-bearing and structural element; it also stands out as one of the most important surface components reflecting the architectural expression, character, and spirit of the building.

As LETOON Architecture, we approach both old and new exposed concrete surfaces with this holistic perspective. We plan our exposed concrete repair, surface rehabilitation, and protection works with a controlled and long-term performance goal, without damaging the unique original texture and mineral structure of the concrete.

Concrete Cosmetics: Highlighting the Character, Not Hiding It

Our main approach in this application area, often defined in literature as "concrete cosmetics", is not to hide or transform the concrete behind synthetic paint layers, but to protect, strengthen its current character, and manage its aging in a healthy way.

The standards targeted in our interventions in this context are:

• Ensuring full harmony with the natural, mineral matte character of the concrete.
• A balanced integration with the existing concrete color that does not stand out.
• Using systems that do not cause texture loss, such as wooden formwork marks, and do not seal off the surface.
• Long-lasting solutions with high UV resistance, non-combustible, and silicification-based.

Mineral Approach: KEIM Potassium Sol-Silicate Systems

One of the main approaches we prefer in exposed concrete applications is mineral-based silicate technology. In this field, KEIM Potassium Sol-Silicate Paints, which we represent, are globally recognized systems developed for mineral surfaces since 1878.

Silicate technology; thanks to its structure consisting of water glass as a binder, inorganic mineral pigments, and fillers, chemically interacts with the applied concrete surface through silicification. Thus, it becomes an inseparable part of the concrete without forming a film coating on the surface.

• Concrete surfaces maintain their natural, mineral matte appearance and do not cause synthetic glare.
• Thanks to its very low Sd (H₂O) value, concrete dries quickly and breathes freely.
• Blistering, peeling, and film layer-induced degradations do not occur.
• Absolute colorfastness (UV resistance) is provided thanks to pure mineral pigments.

Invisible Protection Shield: EVONIK – PROTECTOSIL

With the awareness that long-term performance on concrete surfaces cannot be achieved only by visual improvement, we elevate our surface protection solutions to the molecular level. Accordingly, we actively use EVONIK – PROTECTOSIL silane-based building protection technologies, which have over 60 years of R&D experience, in our projects.

Protectosil systems provide deep penetration into concrete and mineral surfaces, protecting the surface invisibly. Thanks to this technology, effective protection is provided against the following effects that threaten the building's lifespan:

• Reinforced concrete rebar corrosion (rusting danger),
• Structural damage caused by freeze-thaw cycles,
• Salt and sulfate attacks typically seen in industrial or coastal areas,
• Moss, algae, mold, and unwanted graffiti (spray paint) formations.

These solutions permanently prevent water and harmful chloride ions from penetrating the structure while fully maintaining the vapor permeability of the concrete.

The LETOON Approach: Right System, Right Surface, Right Time

On exposed concrete surfaces, we integrate KEIM potassium silicate systems and EVONIK Protectosil silane technologies separately or together depending on the specific needs of the surface. Detailed surface analysis conducted before each project allows us to determine the precise intervention level and the most accurate protection strategy.

As LETOON, our aim is not to ignore the problems of concrete but to read them, not just to intervene in the structure but to improve its performance, and not to produce temporary makeup, but to provide a long-lasting, safe, and sustainable surface performance.

The use of wood in interior design adds warmth, naturalness, and timeless elegance to spaces. However, the coating material you use to protect and beautify the wood should not overshadow this natural beauty, but rather enhance it.

This is exactly where KEIM's innovative silicate paint technology, KEIM Lignosil-Inco, comes into play. This unique product, which allows the wood to breathe, is an excellent choice for your interiors in terms of both aesthetics and health.

From Translucent to Opaque: Unlimited Design Possibilities

KEIM Lignosil-Inco is not just a paint; it is also a design tool. Whether you want to achieve a translucent appearance that highlights the natural grain structure and texture of the wood, or create a completely opaque, modern color layer... Lignosil-Inco offers you this flexibility.

In addition to White, the product does not limit your imagination with the wide color palette available in the KEIM Exclusive and KEIM Avantgarde color charts. All color tones can be mixed with each other, and with monochrome tones between 9001-9010, it adapts to any decoration style. The resulting mineral matte surface offers a noble and modern appearance that does not tire the eyes.

Respect for the Nature of Wood: Optimum Room Climate

One of the most valuable features of wood is its hygroscopic nature; that is, its ability to absorb moisture from the environment and release it when necessary. This feature is the foundation of creating a natural and healthy indoor climate. Unfortunately, many traditional wood coatings destroy this feature by forming a film layer on the surface.

KEIM Lignosil-Inco, however, is produced with a completely different philosophy. Thanks to its non-film-forming and highly permeable (open to diffusion) structure, it allows the wood to breathe. Thus, it preserves the natural hygroscopic balance of the wood and helps maintain a natural, pleasant, and healthy air quality in your space at all times.

A Safe Choice for Your Health and the Environment

The impact of the materials we use in our living spaces on our health is now more important than ever. KEIM Lignosil-Inco is a product developed with this awareness, containing no harmful substances.

• Chemical-Free: Contains no solvents or plastics. As a result, no disturbing odors occur during or after application.
• Certified Safety: Approved by TÜV testing and proven not to emit harmful emissions.
• Ecological Cycle: The product has the Cradle to Cradle certification, which is the highest level of environmental awareness. This is the greatest proof that the product is ecological throughout its entire life cycle.

Long-Lasting Protection and Economical Use

In addition to aesthetics and health, KEIM Lignosil-Inco stands out with its superior performance.

• Color and Light Fastness: Thanks to its mineral structure, its color stability is extremely high. It does not fade over time and is exceptionally resistant to UV rays and light.
• Excellent Adhesion: It adheres perfectly to wooden surfaces, providing long-lasting protection.
• Economical Maintenance: The ability to be repaired locally in areas damaged over time, without the need for a full re-coating, significantly reduces maintenance costs.

The Natural Comfort Wood Offers You

KEIM Lignosil-Inco is much more than a paint for interior wooden surfaces. It is a highly durable, environmentally friendly solution that reveals the natural beauty of wood and offers a healthy living space.

If you want to keep naturalness and aesthetics alive together in your living spaces, you can choose KEIM Lignosil-Inco and feel the natural comfort that wood offers you.