Yes. In fact, concrete is one of the most common and suitable substrates for microcement, provided it is properly prepared.
Here’s what the process typically involves:
- Inspect the concrete
- The concrete should be fully cured (usually at least 28 days old).
- It must be structurally sound, with no major cracks or loose sections.
- Prepare the surface
- Clean away dust, grease, paint, sealers, and other contaminants.
- Grind or sand the surface if necessary to create a good mechanical bond.
- Repair any cracks or holes before installation.
- Apply a primer
- A compatible primer helps the microcement adhere securely to the concrete.
- Install the microcement system
- Apply one or more base coats, often reinforced with fiberglass mesh where recommended.
- Apply the finishing coats to achieve the desired texture and appearance.
- Seal the surface
- Finish with a protective sealer to improve durability and resistance to water, stains, and wear.
Advantages of applying microcement over concrete
- No need to remove the existing concrete in most cases.
- Adds only a thin layer (typically 2–3 mm).
- Creates a seamless, modern finish.
- Suitable for floors, walls, bathrooms, kitchens, stairs, patios, and commercial spaces.
- Available in a wide range of colors and textures.
When it may not be suitable
Microcement should not be applied directly over concrete that is:
- Actively cracking due to structural movement.
- Damp from rising moisture without proper moisture mitigation.
- Weak, crumbling, or delaminating.
- Contaminated with oil or coatings that cannot be adequately removed.
In these situations, the underlying issues should be addressed before installation.
Overall, if the concrete is stable, dry, and correctly prepared, microcement can be installed directly over it, providing a durable and aesthetically pleasing finish with minimal increase in floor or wall thickness.
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