Microcement vs Polished Concrete: What's the Difference?

The confusion between microcement and polished concrete is understandable — both produce that smooth, matte, industrial-modern finish that's so popular in contemporary renovation. But the underlying process, the structural implications, and the context in which each makes sense are quite different. Understanding the distinction helps you make the right choice — or ask the right questions of your contractor.

What Is Microcement?

Microcement (also called micro-concrete, micro-topping, or béton ciré) is a thin-coat decorative coating made from cement, resins, polymers, and mineral pigments. It is applied in multiple thin layers (total thickness 2–4 mm) over an existing surface — concrete, tiles, plaster, wood, or other substrates. It does not form a structural layer — it's a decorative coating applied over whatever is already there.

The key characteristic: microcement is a coating product. It follows the surface it's applied to. It can be used on floors, walls, ceilings, stairs, worktops, and furniture. No structural preparation is required.

What Is Polished Concrete?

Polished concrete is the result of grinding, honing, and polishing an existing or freshly poured concrete slab until the surface achieves a smooth, reflective or matte finish. The concrete itself is the floor — the polishing process refines it.

There are two types:

• Newly poured polished concrete: a concrete slab is poured (typically 80–120 mm thick), levelled, cured, and then ground with progressively finer diamond grinding pads until the desired finish is achieved. This requires significant structural work and loading considerations.
• Polished existing concrete slab: if an existing concrete slab is in good condition, it can be diamond-ground and polished directly. This is more practical in renovation — but the slab must be in adequate condition and already exposed.

Key Differences at a Glance

Appearance: How Do They Look Different?

Both materials can look very similar, particularly in photographs. But in person, there are differences:

• Texture: polished concrete has a coarser, more industrial texture determined by the aggregate and the grind level. The aggregate (stones, sand particles) within the concrete becomes visible at certain grind depths, creating a unique terrazzo-like quality. Microcement can be very smooth — the texture is controlled by the product formulation and the applicator's trowel technique.
• Tonal variation: real concrete naturally develops subtle tonal variation across the slab — slight colour differences from the pour, from curing conditions, and from the grind. This organic variation is distinctive and characteristic. Microcement, being pigmented, tends to be more uniform in colour.
• Edges and details: concrete is cast and ground, so it terminates at edges, walls, and thresholds in a particular way. Microcement can wrap around corners, run up walls, cover worktops, and transition between surfaces in ways concrete cannot.
• Sheen: polished concrete at high grind levels (1,800–3,000 grit) achieves a very high reflective polish. Microcement is typically finished in matte to satin — very high gloss is possible but less common.

Cost Comparison in Portugal

For renovation projects — particularly in apartments or existing buildings — microcement is almost always more practical and cost-effective. Polished concrete makes most sense in new builds, ground-floor spaces where the structural slab can be poured without complications, or where an existing concrete slab is in excellent condition and can be polished directly.

Which Is Suitable for Renovation in Portugal?

Microcement — the renovation-friendly choice

For the vast majority of renovation projects in Portuguese apartments and houses, microcement is the practical answer. It goes over existing floor tiles, over plaster, over concrete — without demolition, without significant structural work, and without the loading concerns of a new concrete pour in an apartment building.

A 4-day microcement floor installation over existing tiles produces a result that, in appearance, closely matches polished concrete — and is visually indistinguishable in photographs. For renovation purposes, microcement is clearly the superior choice in almost all scenarios.

Polished Concrete — when to consider it

Polished concrete makes sense in Portugal when:

• You're building a new house from scratch and want the ground floor finished in polished concrete from the beginning
• You have an existing exposed concrete slab in excellent condition (e.g., a ground-floor space, a former commercial or industrial building) that can be polished directly
• You specifically want the natural aggregate-visible, terrazzo-style look that only real polished concrete can provide
• Maximum long-term durability is the priority and budget and timeline allow for structural work

What About Béton Ciré?

You may also encounter the term béton ciré (French, literally "waxed concrete"). In practice, béton ciré is a type of microcement — a thin-coat cementitious coating applied in layers and finished with a wax or sealer. The term is particularly common in French-speaking markets and among Portuguese clients with French connections. The finish is similar to microcement — often slightly warmer and more organic in appearance. The application process and maintenance requirements are essentially the same.

Maintenance: How They Compare Long-Term

The maintenance requirements of both materials are similar — pH-neutral cleaning and periodic treatment of the surface. The main difference is durability of the surface itself: polished concrete is harder and more scratch-resistant than microcement, which relies more on its sealer layer for protection.

For more detail, read our guides on microcement floors in Portugal, microcement costs, and visit our microcement service page.