Last Updated: October 31, 2026
Quick Summary
Spray-on concrete is a thin, cement-based overlay sprayed onto an existing patio slab to refresh its surface. It is typically only a few millimetres thick and is not a structural repair, so it only performs well on a stable, dry, draining slab.
Spray-on concrete is a thin, cement-based overlay that is applied by spray to an existing slab, usually a patio, to refresh its surface. The method is often called spraycrete. The layer is typically only a few millimetres thick, which is why it can resurface a tired patio without the cost and mess of breaking the old slab out.
It helps to be clear about what the product is not. Structural shotcrete is a different process. It is sprayed to build new concrete thickness, support loads, and form walls or structural elements. A patio coating does none of that. It sits on top of a sound slab and changes how the surface looks, feels and resists wear. Confusing the two is a common mistake, and it leads people to expect a patio overlay to fix a structural problem it cannot solve.
Spray-on concrete is also a different product from a sealer. A sealer soaks in or forms a film and mainly protects against stains and moisture. The overlay adds a new layer of material, which means it can hide colour changes, smooth surface wear, and add texture or decorative patterns.
Quick answer: For patios, spray-on concrete is a thin resurfacing layer, not a structural repair.
Not every patio is a good candidate. Check a pre-resurfacing considerations list to confirm whether your slab is suitable. A thin overlay is a cosmetic and protective skin, so it can only perform as well as the slab beneath it. The single most useful question is not "what colour do I want?" but "is this slab stable, dry and draining?"
Work through these checks before you commit to any quote.
A sound slab is one that is not moving. Look for:
If any of these are present, the honest answer may be slab repair, re-laying or replacement before any decorative coating is considered.
Moisture is the quiet killer of thin overlays. Two things matter:
An overlay needs a clean, sound, absorbent surface to bond to. Watch for:
A common pattern is an overlay that looks excellent for a season and then shows hairline cracking, hollow spots or patches lifting. The usual causes are:
Ask what will be done about joints, cracks and any damp areas, and get that written into the quote.
The process follows a clear sequence. See the full resurfacing walkthrough for each stage before you decide. Skipping any stage is the fastest way to a coating that peels or cracks early.
Preparation carries more weight than anything else. The new layer can only bond to a surface that is clean and sound. Cleaning removes dirt, grime, moss and loose material, and oil stains and old coatings must be dealt with before the spray goes on.
Cracks should be addressed at this stage so the overlay does not simply bridge over a weak spot. Once cleaned and repaired, the surface should be checked again for any loose sections that need removing.
Once the surface is ready, the material is sprayed onto the slab.
Curing takes time. The surface needs to stay moist for a period, and foot traffic should be kept off until it has set. Weather matters a great deal. Very hot, windy or freezing conditions can cause the layer to dry too fast or too slow. Planning the job around a stable weather window gives the best result.
Watch out: Rushing the curing period is the most common reason a fresh patio coating looks good on day one and fails within months.
Finish choice is one of the main reasons people choose this method. Compare stenciled and stamped patios against spray-on finishes to see how they stack up.
Slip resistance deserves attention, especially near pools and wet outdoor areas. A smooth finish looks clean but can become slippery when wet. A textured finish gives more grip. Discuss the surfaces most likely to get wet and choose a texture to match.
Pricing for a spray-on patio overlay is quoted per square metre, but the rate is not fixed. Two patios of the same size can attract very different quotes because the preparation and finish differ. Pricing depends on the patio area, the condition of the existing slab, the amount of repair needed, the finish chosen and site access, so a written quote after a site inspection is the only reliable number.
Ask for a quote that separates:
That breakdown lets you compare like with like. A cheap quote that skips preparation or repairs is not a saving; it is a shortcut that usually shows up as peeling or cracking within a year or two.
For current prices or a quote for your patio, visit the Spray Pave Pro website and request a free quote.
The price of a spray-on patio overlay depends on several variables, summarised below.
| Cost driver | What it affects | Note |
|---|---|---|
| Area | Rate per square metre | Larger patios usually cost less per square metre |
| Preparation | Labour | Stripping to bare concrete costs more than a clean |
| Repairs | Price added on top of the coating | Extensive repairs can add a significant percentage |
| Finish and detail | Time, materials and skill | Flat colour is cheapest; textures and patterns cost more |
| Access | Crew time and charges | Tight access, stairs or steep blocks slow the crew |
| Sealer and coats | Price and lifespan | Affects both cost and how long the finish lasts |
| Weather and scheduling | Duration and cost | Weather-dependent jobs may take longer |
A well-prepared and properly cured overlay needs some ongoing care. Regular sweeping and gentle cleaning keep the surface looking good. Avoid harsh chemicals and abrasive tools that can wear the finish. Reseal the surface when the manufacturer's guidance or your installer recommends it, since resealing helps protect against stains and moisture.
Heavy vehicle use, dragging furniture, and freeze-thaw damage can all shorten the life of any patio surface. Lifespan is best estimated after a site check rather than promised in advance.
If your patio is cracked, stained or worn, the next step is a site assessment. The team at Spray Pave Pro, with over 23 years of experience, can help you understand what your patio needs. Get a free quote to get started.
Spray-on concrete is a thin, cement-based overlay applied with spray equipment to an existing concrete patio. Because it bonds to the old surface, it can refresh cracked, stained or worn patios without demolition. It is a resurfacing product, not a structural repair, so the existing slab must be sound and properly prepared before application.
Yes, provided the existing slab is structurally sound, free of loose material and properly cleaned. Surface preparation, including pressure cleaning and repair of cracks, is what determines whether the overlay bonds well. Large movement cracks, sinking slabs or areas with active water problems should be assessed first, because a coating cannot correct structural faults underneath.
Spray Pave Pro does not publish fixed prices. For current prices or a quote for your patio, visit the Spray Pave Pro website and request a free quote.
Lifespan depends on the preparation quality, the traffic and weather the patio receives, and how it is maintained. Regular cleaning and timely resealing extend the life of the finish considerably.
