The Biggest Microcement Application Mistakes to Avoid

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…and how to fix them!

Microcement is a popular choice for modern, seamless surfaces in homes and commercial spaces. However, improper application can lead to cracks, uneven textures, or poor adhesion. Whether you’re a professional installer or embarking on a DIY microcement project, knowing the most common microcement installation mistakes — and how to fix them — can save you time, money, and frustration.

microcement application

1. Skipping Proper Surface Preparation

The Mistake: Applying microcement on a dirty, damp, uneven or unstable surface can lead to adhesion problems, peeling, or cracking over time.

How to Fix It:

  • Always clean and degrease the surface before application.

  • Ensure it is completely dry and free of dust, oil, or loose particles.

  • You may need to level the surface, especially for application over tiles.

  • Fix any damage in the surface prior to application, especially cracks (if you apply microcement over an open fracture, the cracking can transfer through).

2. Neglecting Proper Waterproofing

The Mistake: Assuming microcement is naturally waterproof and skipping a proper waterproofing system can lead to moisture penetration, staining, or surface deterioration — especially in bathrooms and kitchens.

How to Fix It:

  • Apply a waterproofing membrane before installing microcement in wet areas.

  • Use a microcement system specifically designed for high-moisture environments.

  • Seal the final surface with a high-quality, water-resistant sealer.

  • Regularly check and maintain the sealer to ensure ongoing protection.

3. Applying Microcement Too Thick or Too Thin

The Mistake: A layer that is too thick can lead to cracking, while a layer that is too thin may not provide enough coverage or strength.

How to Fix It:

  • Apply microcement in multiple thin layers (usually 2-3mm per coat).

  • Use a trowel to spread each coat evenly, and avoid excessive buildup.

  • Allow each layer to dry properly before applying the next.

4. Rushing the Drying Process

The Mistake: Speeding up drying with heaters or failing to respect curing times can weaken the final result.

How to Fix It:

  • Allow each layer to dry naturally for the recommended time.

  • Maintain a stable room temperature (ideally between 15-25°C).

  • Wait at least 24-48 hours before applying sealers or topcoats.

5. Not Using the Right Sealer

The Mistake: A poor-quality or incompatible sealer can lead to stains, water absorption, or surface degradation.

How to Fix It:

  • Choose a high-quality sealer for durability and stain resistance.

  • Allow it to cure properly — this means no washing your microcement floors for at least a week after installation.

  • Reapply the sealer periodically to maintain protection (for decorative applications, this won’t be as much of a concern as it is for high-traffic flooring).

6. Ignoring Expansion Joints

The Mistake: Covering existing expansion joints can cause cracks when the substrate moves.

How to Fix It:

  • Never apply microcement directly over expansion joints.

  • In this case, expansion gaps or saw cuts will be required — engage a professional installer if needed.

Microcement is a fantastic material when applied correctly, offering a finish that’s both beautiful and durable. By avoiding these common mistakes, you can achieve a flawless result that lasts for years.

If you’re not confident in your skills with a trowel, are tackling a large area, or aren’t familiar with substrate preparation and waterproofing process, it’s best to hire a surfacing professional to ensure the best result.

Contact our team of Melbourne microcement installers for a quote.