Microcement — a thin-coat cement-based overlay applied directly to walls, floors and surfaces — has surged in popularity in UK interior design over the past several years. Its seamless, industrial aesthetic works across kitchens, bathrooms, floors and feature walls. But microcement is not without maintenance challenges: it can crack, chip and lose its sealed finish over time, and repairing it requires a different approach from traditional stone or tile repair. This guide explains the main types of microcement damage and how professional repair addresses them.
How Microcement Can Be Damaged
- Surface cracks — microcement is applied in very thin layers (typically 2–3mm total) and follows the substrate beneath it; if the substrate moves, cracks or flexes, hairline cracks can appear in the microcement surface
- Impact chips — while microcement is hard when cured, direct impact from dropped objects can chip or spall the surface, particularly at edges and corners
- Loss of surface seal — microcement requires a protective sealer to resist staining and moisture; worn or damaged sealer leads to staining, discolouration and eventual surface degradation
- Delamination — in poorly prepared or moisture-affected installations, microcement can delaminate from the substrate; this appears as bubbling or hollow-sounding sections
Hairline Crack Repair in Microcement
Fine hairline cracks in microcement can be filled with a compatible microcement repair compound matched to the surface colour, then re-sealed. The challenge is colour-matching: microcement’s tonal appearance varies with the application method, the sealer used and natural ageing. A repair applied with new microcement over aged existing material will almost always be visible to some degree under certain lighting. The repair is most invisible where the existing microcement has been sealed with a matt sealer rather than a gloss finish.
Impact Chip Repair
Chips in microcement at corners, edges and floor surfaces are repaired using compatible filler compounds. As with crack repair, colour-matching to aged microcement requires experience with the material. Results are typically very good for discrete chips in less critical locations; chips in high-visibility flat field areas on walls require the most careful blending.
Sealer Restoration
If the sealer on a microcement surface is worn, damaged or stained, restoration involves cleaning the surface thoroughly, addressing any chips or cracks first, and then applying a fresh coat of compatible sealer. The type of sealer matters — water-based and solvent-based sealers interact differently with existing finishes, and using the wrong product can cause adhesion failure or discolouration.
