Microcement has emerged as a preferred surface finish in modern architecture and industrial design due to its seamless aesthetic, durability, and versatility. Its ultra-thin application—typically 2 to 3 mm—makes it ideal for both new constructions and renovations. However, one of the most common technical questions from contractors, manufacturers, and specifiers is: what can microcement stick to?
This article provides a comprehensive, professional breakdown of suitable substrates for microcement application, supported by practical insights and installation advice.
What Is Microcement?
Microcement is a polymer-modified, cement-based coating applied in thin layers to create a seamless, high-performance surface. Its adhesion properties are among its biggest strengths, enabling it to bond with a wide variety of materials—provided surface preparation is executed correctly.
Suitable Substrates for Microcement Application
1. Concrete and Cement Screeds
Concrete is one of the most compatible substrates for microcement due to its similar composition and structural integrity.
Requirements:
- Must be fully cured (typically 28 days)
- Free of moisture, dust, and contaminants
- Surface should be levelled and primed
Practical Tip: Use a suitable microcement primer to ensure maximum adhesion. For rough or porous concrete, apply a levelling compound to reduce absorption.
2. Tiles (Ceramic, Porcelain, Stone)
Microcement can be applied directly over tiled surfaces, making it a popular choice for refurbishment projects.
Preparation Process:
- Deep clean and degrease the tile surface
- Fill grout joints to ensure a smooth base
- Sand or etch the surface to improve mechanical grip
- Apply a bonding primer
Use Case: Ideal for modernising kitchens, bathrooms, and commercial retail spaces without the need for tile removal.
3. Plasterboard (Drywall)
Plasterboard is a lightweight and commonly used substrate in interior walls and ceilings. Microcement adheres well, but the substrate must be properly reinforced.
Key Considerations:
- Use a fibreglass mesh to prevent microcement cracking due to board movement
- Ensure joints are flush and sealed
- Prime the entire surface before application
Advice for Installers: Avoid applying microcement directly over flexible joints—these areas must be stabilised with mesh or movement joint systems.
4. Wood (MDF, Plywood, Furniture)
Microcement can be used to coat furniture, cabinetry, or timber floors, providing a contemporary, concrete-like finish.
Critical Factors:
- Wood must be stable, dry, and non-flexing
- Apply a moisture-resistant primer or epoxy layer
- Sand the surface lightly to enhance mechanical bonding
Note: Wood is more prone to expansion and contraction, so always use a flexible microcement system to accommodate minor movements.
5. Metal Surfaces (Steel, Aluminium)
Although less common, microcement can adhere to metal with proper treatment. This is typically used in custom furniture, signage, or architectural detailing.
Surface Prep:
- Abrade the surface to increase grip
- Apply a metal-compatible primer (epoxy-based)
- Protect against oxidation or rust before applying microcement
6. Glass and Epoxy Resin
Smooth, non-porous substrates like glass or epoxy require specialised primers to allow adhesion.
Professional Tip: Use a two-part epoxy primer designed for non-porous surfaces and consider applying a fine grain broadcast to improve microcement bonding.
7. Existing Paint or Coatings
Microcement can be used over painted surfaces if the paint is stable and non-peeling. However, this application requires caution.
Steps to Follow:
- Check for adhesion or blistering in existing coatings
- Sand to roughen the surface and remove gloss
- Prime with a universal microcement bonding agent
Surfaces Microcement Should Not Be Applied To
While microcement is highly versatile, it is not suitable for:
| Unsuitable Substrate | Reason |
|---|---|
| Unstable or moving surfaces | Can cause cracking and delamination |
| Damp or wet substrates | Leads to poor adhesion and surface failure |
| Flaking paint or failing tiles | Prevents proper bonding |
| Flexible plastics or vinyl | Insufficient rigidity for microcement systems |
Recommendation: Always conduct a substrate inspection and perform adhesion testing before committing to a large-scale application.
Best Practices for Maximising Adhesion
- Surface Preparation Is Non-Negotiable
Cleaning, sanding, degreasing, and priming must be done meticulously for a successful application. - Use the Right Primer for the Substrate
Microcement systems offer different primers—select based on whether the substrate is porous, absorbent, or chemically resistant. - Control Moisture and Temperature
Substrate moisture content should be below 4%. Avoid applying in environments with high humidity or extreme temperature swings. - Consider a Mesh Reinforcement Layer
Especially for drywall or wood, a fibreglass mesh between layers reduces the risk of cracks due to substrate movement.
Conclusion
Microcement is a highly adaptable finishing material, capable of bonding to a wide range of substrates—from concrete and tiles to plasterboard and wood. However, its success relies heavily on correct preparation and system compatibility.
For manufacturers, contractors, and specifiers, understanding what microcement can stick to is essential to ensuring long-term performance, aesthetics, and client satisfaction. By adhering to best practices and using professional-grade materials, microcement can transform surfaces efficiently and beautifully—whether for architectural design, industrial refurbishment, or commercial fit-outs.