Microcement: Pros, Cons and Where to Use It at Home

Microcement is a thin decorative coating made of cement, fine aggregate, polymers and pigments, applied by trowel in several layers to floors, walls, countertops and even furniture. It produces a seamless, concrete-like surface only a few millimetres thick, which is why it is popular for renovations where hacking existing tiles is undesirable. It is also one of the most misunderstood finishes, sold as if it were indestructible when in practice its performance depends almost entirely on the substrate and the applicator.

This article explains what the material is, how it is applied, the advantages and the limits, why it cracks, and whether it is a sensible choice for bathrooms and kitchens in Singapore flats. It is written from the perspective of what the finish is bonded to, because that is where most problems begin.

What microcement is, and what it is not

The material is a polymer-modified cementitious mortar with very fine aggregate. The polymers, usually acrylic or similar resins, give it adhesion, flexibility and lower permeability than ordinary cement render. It is applied in layers that together are typically only a few millimetres thick, then sealed with a protective coat, often polyurethane or epoxy based.

It is not concrete, and it is not a screed. A screed is a thicker levelling layer that can correct falls and unevenness, while microcement is a skin that follows the shape of whatever lies beneath. It does not add structural strength, and it cannot bridge significant movement. Our guide to the cement screed flooring look compares the options for achieving a concrete aesthetic, including thicker cementitious toppings and resin systems.

How microcement is applied

Application is a multi-stage, hand-trowelled process, and each stage has a purpose.

Substrate preparation: the surface is cleaned, loose material removed, and any defects repaired. Existing tiles must be firmly bonded; hollow or cracked tiles are removed. Glossy surfaces are abraded.
Primer: a primer suited to the substrate improves adhesion and controls absorption.
Base coats with mesh: one or two coarser base coats are applied, often with a fibreglass reinforcing mesh embedded in the first, particularly over tiles or at junctions between materials.
Finish coats: finer coats are trowelled on and sanded between passes to build the texture and colour.
Sealer: several coats of sealer protect against water, stains and wear.

Because it is applied by hand, the final look varies with the applicator’s technique, and the same product can look elegant or patchy. Drying time between coats, ambient humidity and temperature all affect the result, which matters in Singapore’s warm, humid conditions.

Advantages and drawbacks

The advantages are real. The finish is seamless, with few or no grout lines, and can run continuously from floor to wall to vanity. It is thin, so it can go over existing tiles in many cases without raising floor levels much, a useful option alongside the choices discussed in our article on tile overlay versus hacking. It suits minimalist and Japandi interiors and can be tinted to a wide range of colours.

The drawbacks are equally real:

It is only as good as its substrate and will reproduce cracks, movement and hollow spots underneath.
Quality depends heavily on the applicator, and repairs are hard to blend invisibly.
The sealer is the main barrier to stains and water and wears over time, especially on floors, so it needs periodic renewal.
Its thinness makes it vulnerable to impact from dropped heavy objects and to scratching by grit.
Slip resistance on floors depends on texture and sealer and should be checked for wet areas.

Why microcement cracks

Cracking is the most common complaint, and it almost always has a cause beneath the surface. The thin coating is bonded to its substrate, so any movement in that substrate is transmitted straight through.

Substrate cracks and movement

Existing cracks in a slab or screed, shrinkage cracks in fresh render, and joints between dissimilar materials, such as where a concrete wall meets a brick infill or a drywall partition, will often reflect through the finish. Movement joints in the building structure must be carried through as joints in the coating, not bridged.

Tile joints and hollow tiles

Over tiles, grout lines can telegraph through as faint lines or cracks if not filled and reinforced with mesh. Tiles that are hollow beneath will flex and crack the finish above them, which is why tapping every tile before application is essential.

Moisture and incomplete curing

Application over a damp substrate, or sealing before the layers have dried sufficiently, can cause bubbling, delamination and cracking. Fresh screeds need time to dry before being coated.

Fine hairline crazing in the surface can also arise from coats applied too thickly or dried too quickly. Our guide to types of concrete cracks helps distinguish surface shrinkage from structural movement, which is the first question to answer when cracks appear.

Is microcement suitable for wet areas?

It can be used in bathrooms and showers, but only as a finish over a properly waterproofed substrate, not as the waterproofing itself. The coating and sealer resist water on the surface; they are not designed to act as the primary barrier against leaks into the slab below. In an HDB or condominium bathroom, the waterproofing membrane beneath must be intact and tested before the finish is applied, and any breach of the membrane, for example from removing tiles, must be made good first. Our guide to bathroom waterproofing in HDB flats explains what that layer does and why it matters to the unit below.

In showers, the floor still needs correct falls to the drain, which a few millimetres of coating cannot create, so falls must be built into the screed. The sealer must be suitable for permanent wetting and renewed as it wears. Junctions with drains, niches and glass screens need careful detailing. Where these conditions cannot be met, tiles or stone remain the lower-risk choice in the wettest zones, and the finish can be reserved for vanity walls and areas that see only splashes.

Kitchens raise similar issues. Countertops and splashbacks are exposed to heat, acids, oils and knives. A good sealer helps, but a microcement worktop is more vulnerable to marking than stone or engineered surfaces and needs gentle use.

Where microcement works best

The finish is at its best on stable, dry substrates with limited wear: feature walls, living and bedroom floors with soft furnishing, vanity units and bathroom walls outside the shower, and furniture. It is riskier on surfaces over known cracks, over lightweight partitions without proper preparation, in showers without reliable waterproofing and falls, and on heavy-use kitchen worktops.

Before committing, inspect the substrate honestly: tap tiles, map cracks and identify joints between materials. If cracks are active or their cause is unclear, resolve that first.

Frequently asked questions

Can microcement be applied over existing tiles?

Often yes, if the tiles are firmly bonded, clean and flat. Hollow or cracked tiles must be removed, grout joints filled, and a reinforcing mesh embedded in the base coat to reduce the risk of tile lines and cracks showing through.

Is microcement waterproof?

The sealed surface resists water, but the coating should not be relied on as the waterproofing layer. In bathrooms a proper membrane beneath, correct falls to drains and a sealer suited to wet conditions are all required.

Why is my microcement floor cracking?

Most cracks reflect something beneath: a cracked slab, movement between different materials, hollow tiles, or application over a damp substrate. Identifying and treating the cause is necessary before any repair to the finish will last.

How long does microcement last?

On a stable substrate with good application, the coating itself can last many years, but the sealer wears with use and needs periodic renewal, especially on floors and in wet areas.

Seeing cracks through a thin floor or wall finish and want to know what is happening beneath? Talk to our consultancy or get in touch.