What Is an Epoxy Surface System?
Epoxy is a surface system — not a paint. It consists of three chemically distinct layers: a low-viscosity penetrating primer that wicks into the concrete pores and forms the mechanical bond anchor; a 100% solids base coat that builds the body, colour, and thickness of the system; and a polyurethane or aliphatic topcoat that provides the hardness, scratch resistance, and UV stability visible on the finished surface. Each layer has a specific function. Remove any one of them and the system performs differently.
The substrate defines the system's lifespan more than the product does. Epoxy bonds to concrete at a molecular level — but only if the concrete is properly profiled, dry enough, and free of surface contamination. Diamond grinding opens the capillary pores so the primer can penetrate rather than film-form on top. Moisture testing establishes whether the slab is within the acceptable threshold for bonding. In Saudi Arabia, where concrete is often poured in summer heat and loses surface moisture rapidly while trapping internal moisture for months, skipping the test is the single most common cause of early failure.
The cost range of SAR 30–35/m² applies to standard solid-colour systems on open concrete areas where preparation is straightforward. Metallic and decorative systems, smaller areas where mobilisation costs are spread over less surface, or substrates requiring moisture treatment after testing all sit above this range. Every quote is fixed after a site visit — the assessment cost is zero.
Three Steps. Each One Non-Negotiable.
The preparation takes longer than the application. That proportion is intentional — it is how a permanent surface is built versus a temporary one.
Moisture Testing — The Step Most Contractors Skip
Sealed calcium chloride cells are placed at multiple zones across the slab and left for 60 hours. The test measures moisture vapour transmission rate — the volume of water vapour rising through the concrete per unit time. Saudi concrete poured in summer heat loses surface moisture so fast that internal moisture becomes trapped inside. That internal vapour continues rising for months after the surface feels dry. When epoxy seals the surface, vapour pressure builds at the bond line until adhesion fails. The test costs time. Skipping it costs a floor.
Surface Preparation — Diamond Grinding to Concrete Surface Profile 3
Diamond-segment machines grind to CSP 3 — a surface profile that removes all laitance and opens the concrete pore structure to the correct depth for primer penetration. Laitance is the weak, powdery top layer present on every poured concrete surface. It forms naturally as water rises during the pour and carries fine cement particles to the top. Bonding primer to laitance bonds to powder, not concrete — the system debonds as the laitance detaches. Grinding is not optional surface preparation. It is the mechanical bond creation step.
System Application — Primer, Base, and Topcoat Within the Correct Windows
Each coat is applied within the recoat window of the previous one — the window during which the preceding layer has cured sufficiently to accept the next but not so fully that intercoat adhesion is compromised. If ambient relative humidity exceeds 85% or the concrete temperature is within 3°C of the dew point, the surface skins with condensate that prevents bonding. In Saudi summer conditions, we schedule application for early morning and monitor conditions continuously. If conditions degrade mid-application, work stops. A delayed project is recoverable. A compromised bond is not.
The Epoxy System — Layer Functions and Performance Parameters
A correctly installed epoxy system is defined by what each layer contributes, not by the finished appearance alone.
| Property | Value |
|---|---|
| Primer — Layer 1 | Low-viscosity penetrating epoxy |
| Base coat — Layer 2 | 100% solids epoxy, 1–3mm |
| Topcoat — Layer 3 | Polyurethane or aliphatic epoxy |
| Total installed thickness | 2–4mm typical |
| Moisture threshold before application | Less than 75% RH in slab |
| Application temperature window | 10–35°C substrate temperature |
| Substrate types accepted | Concrete, tile, screed, existing coatings |
| Anti-slip option | Broadcast aggregate in topcoat |
| UV-stable topcoat option | Aliphatic epoxy or polyurethane |
Epoxy vs. Other Hard Surface Systems — Where It Wins and Where It Doesn't
| Feature | ★ Our StandardPolished Concrete | Microcement | Ceramic Tile | Vinyl / SPC |
|---|---|---|---|---|
Chemical resistance — acids, oils, cleaning agents | ✓ Good surface resistance with correct sealer — unprotected concrete etches under strong acids | Moderate — sealer selection is critical for chemical-heavy environments | Tile surface resists most chemicals but grout joints absorb and stain permanently | Poor — solvents attack the vinyl compound and the adhesive layer beneath |
Applied to walls as well as floors | ✓ Floor-only — polished concrete cannot be applied to vertical surfaces | Excellent for walls, ceilings, and all vertical geometry | Wall tiles are a separate product requiring a different adhesive system | Floor-only product — not appropriate for wall application |
Cost — SAR per square meter installed | ✓ SAR 40–50/m² — but existing floor demolition frequently adds SAR 15–25/m² on renovations | SAR 80–130/m² — higher cost, works on any surface without demolition | SAR 45–120/m² — wide range based on tile format and quality | SAR 30–60/m² — overlapping range; similar for premium products |
UV stability — sustained direct sun exposure | Good with correct guard — stays consistent in colour outdoors | ✓ Good with aliphatic sealer — suitable for outdoor wall applications | Excellent — fired ceramic glaze is UV-immune | Good — modern SPC with UV coating handles outdoor exposure |
Warmth and natural appearance | ✓ Natural concrete character — warm grey tones develop over time | Mineral cement texture with over 100 colour options — warmer than epoxy | Unlimited patterns and materials — can replicate any natural surface | Synthetic appearance — limited to flat printed finishes |
Epoxy is the right answer in specific conditions. In others, a different system serves better. This comparison helps identify which situation you are in.
SAR 30–35
Per m²
Standard systems on open concrete areas
60 Hours
Moisture Test
Sealed CaCl₂ cells on every project
Floors + Walls
Both Surfaces
Same primer-base-top system on vertical and horizontal
2–4 Days
Installation
Depending on area size and system type
Before You Decide
Two causes — both preventable. First: moisture testing is skipped. Saudi concrete, especially on new builds and summer pours, carries elevated internal moisture vapour that continues rising for 12–18 months after the slab feels dry. Epoxy seals the surface without addressing this, vapour pressure builds beneath the bond line, and the coating delaminates. Second: diamond grinding is rushed or skipped entirely, so the primer bonds to loose surface laitance rather than structural concrete. Both problems require time to prevent correctly. That is why they get skipped.
Standard aromatic epoxy will yellow — sometimes significantly — when exposed to direct UV light. For any surface that receives sustained direct sun, we specify either aliphatic epoxy or polyurethane topcoat. Both are UV-stable and do not yellow under prolonged exposure. We identify this requirement during the site assessment and specify accordingly — you will not receive an aromatic system on a sunlit surface.
Sometimes yes, sometimes no. Fully bonded, solid tiles can be coated over after correct profiling. Hollow, cracked, or poorly adhered tiles transfer their instability into the epoxy system and cause early failure. We tap-test every tile during assessment. If more than 10–15% are hollow, we recommend removal before proceeding. If the tiles are structurally solid, we can coat directly over them.
SAR 30–35/m² applies to standard solid-colour systems on open concrete areas with straightforward preparation — typically large areas where mobilisation costs are spread efficiently. The price increases for: areas under 50m², metallic or decorative finish systems, substrate moisture treatment identified after testing, or removal of existing coatings before application. Every quote is fixed after a site visit — no additions once work starts.
A correctly prepared and applied epoxy system — moisture-tested slab, diamond-ground surface, correct primer and topcoat — lasts 10–15 years in standard use before the topcoat requires attention. The substrate bond, if correctly formed, is essentially permanent. What degrades over time is the topcoat hardness and sheen. This is a maintenance item: the topcoat can be abraded and recoated without removing the base system. Systems applied without correct preparation fail in 1–3 years regardless of product quality.
How Big Is the Area? That Is All We Need to Start.
Before we price any epoxy project, we visit the site, test the moisture in the slab, assess the existing surface, and confirm what system is correct. The visit is free. The quote is fixed after it — no additions once work starts. We cover all of Saudi Arabia.