Transforming a wall with microcement creates a seamless, sculptural surface that feels both luxurious and industrial. This ultra-thin coating bonds directly to existing substrates, delivering a continuous finish free of joints or tiles. Achieving a flawless result requires meticulous preparation, precise mixing, and a practiced application technique. Understanding the specific needs of wall applications is the first step toward a successful microcement transformation.
Understanding Microcement and Wall Application
Microcement is a composite material composed of cement, fine aggregates, special additives, and pigments. It is engineered for high flexibility and adhesion, allowing it to span cracks and movements without cracking. When applied to walls, its thin profile preserves space while completely renewing the visual character of the surface. The key to durability lies in the bond between the microcement and the prepared substrate, which must be stable, absorbent, and clean.
Preparation: The Critical Foundation
Skipping preparation is the primary cause of failure in microcement projects. Walls must be structurally sound, dry, and free of any contaminants. Remove old paint, wallpaper, grease, and dust with a powerful detergent and rinse thoroughly. Seal porous substrates like concrete or plaster to prevent rapid drying. For non-porous surfaces like tiles, gentle sanding creates a key for the bonding agent to grip effectively.
- Repair cracks, holes, and uneven surfaces with a suitable filler.
- Ensure electrical outlets and switches are properly protected.
- Apply a primer specifically designed for microcement systems.
- Verify the ambient temperature is between 5°C and 35°C during application.
The Application Process for Walls
Applying microcement to walls is a dynamic process that demands patience and attention to detail. The work is divided into distinct layers, each serving a specific function. The initial layer is a foundational coat that locks into the substrate, while subsequent layers build the desired thickness and texture. Gravity works against you on vertical surfaces, so managing the flow of the material is essential to avoid drips and streaks.
Mixing and Priming for Adhesion
Accurate dosing of the powder and liquid components is vital to achieve the correct consistency and mechanical properties. Use a mechanical drill with a paddle mixer to ensure a uniform mixture without lumps. The base primer is applied with a roller or brush, penetrating deeply to stabilize the substrate. This layer must be fully cured according to the manufacturer’s instructions before the sealing and final topping layers are applied.
Techniques for a Flawless Finish
The final aesthetic is created by the careful manipulation of the microcement. Professional applicators use steel trowels and sponges to compress the material and align the aggregate. For walls, the "cross-hatch" technique is often employed, where the first pass is vertical and the second is horizontal. This method ensures full coverage and hides the pattern of the previous coat, resulting in a perfectly smooth plane.
| Tool | Purpose | Stage |
|---|---|---|
| Steel Trowel | Compacting and leveling the surface | Final Application |
| Notched Trowel | Applying the base primer evenly | Preparation |
| Sponge | Removing excess material and smoothing edges | Finish |
Drying, Sealing, and Long-Term Care
After the final layer is applied, the wall requires sufficient time to dry completely. Initial drying usually takes 24 hours, but full polymerization can extend over several days. Once cured, a specialized sealant is applied to enhance stain resistance and facilitate future cleaning. To maintain the pristine condition of the microcement wall, avoid abrasive cleaners and use gentle, pH-neutral solutions to preserve the integrity of the finish.
