The Biggest Microcement Application Mistakes to Avoid
…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.
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.