Can Microcement Crack? Causes, Prevention, and What to Do About It
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Let us address this one head-on. If you search "microcement" online, you will find horror stories about cracking. Photos of peeling surfaces, hairline fractures, and finishes that look nothing like the showroom.
So can microcement crack? Technically, yes — any material can. But here is the more important question: does it crack when installed correctly? No.
Why Most Microcement Cracking Happens
Almost every case of microcement cracking traces back to one of these causes:
1. Poor Substrate Preparation
This is the number one reason. If the surface underneath the microcement is not stable, clean, and properly primed, the coating has no solid foundation.
Common substrate problems: loose or hollow tiles that move underfoot, cracks in the existing concrete that were not addressed before application, moisture issues like rising damp or a leaky pipe that compromise the bond, and dusty or contaminated surfaces that prevent proper adhesion.
A good installer assesses the substrate before any microcement goes on. If there is a problem, it gets fixed first.
2. Skipping the System
Microcement is not a single product — it is a multi-layer system. Each layer serves a purpose: bonding, reinforcing, finishing, and sealing. Skip a layer, substitute a product that was not designed for the system, or rush the drying times, and you create weak points.
The most common shortcuts that cause problems: skipping the primer, not using mesh reinforcement where it is needed, applying finish coats before base coats are fully cured, and using the wrong sealer for the application.
Microcement USA only sells the complete Forcrete system, and we train every installer on how to use it properly. That is not a coincidence.
3. Wrong Product for the Application
Not all microcement is the same. A product designed for interior walls might not perform on a floor that sees heavy traffic. A system without proper waterproofing will fail in a shower.
Microcement USA offers different products for different applications — floors, walls, wet areas, outdoor surfaces — because the demands are different. Using the right product for the right job is fundamental.
4. DIY Kits and Untrained Application
This is where the vast majority of online horror stories come from. Cheap kits sold without training or system support often use lower-quality materials, skip reinforcement, and come with instructions that oversimplify the process.
Microcement application is a skilled trade. It is not complicated, but it is precise. Thickness control, drying times, trowel technique, and sealer application all matter. That is why Microcement USA requires training before product purchase.
5. Structural Movement
If a building settles significantly, or if a concrete slab develops a major crack, that movement can transfer through any surface finish — including microcement.
The Forcrete system has flexibility built into it. The combination of a flexible primer, fiberglass mesh, and a multi-layer build-up allows the system to absorb minor substrate movement without cracking. This is a significant advantage over rigid finishes like tile — where grout cracks — or epoxy, which is brittle.
For major structural movement, no surface finish is going to prevent cracking. The structural issue needs to be addressed first.
How to Prevent Microcement Cracking
The prevention checklist is straightforward:
Assess the substrate thoroughly. Check for stability, moisture, cracks, and adhesion.
Fix problems before you start. Repair cracks, address moisture, remove loose material.
Follow the full system. Primer, mesh where needed, base coats, finish coats, sealer. No shortcuts.
Use the right product for the application. Floors get floor products. Wet areas get waterproof systems.
Respect drying times. Each layer needs to cure before the next one goes on. Rushing this is asking for trouble.
Get trained. This is the single most effective way to prevent cracking. Microcement USA training covers all of these points with hands-on practice.
What If a Crack Does Appear?
One of microcement's advantages over tile is repairability. If a crack develops — from impact damage, for example — a trained installer can do a spot repair.
The process involves cleaning and prepping the cracked area, applying fresh microcement to blend with the surrounding surface, and resealing the repaired area.
The repair blends into the existing surface because of microcement's natural variation in tone and texture. It is not invisible, but it is far less noticeable than a replaced tile with mismatched grout.
The Installer's Responsibility
If you are going to offer microcement, take the training seriously. Your reputation depends on the quality of your installations, and cracking is the one thing that will get you bad reviews and callbacks.
The good news: when you use the Microcement USA Forcrete system and follow the process, cracking is not something you need to worry about. The system is designed to prevent it.
Learn the system. Follow the system. Trust the system.