About Fosroc Concure AC

Fosroc Concure AC is a membrane-forming concrete curing compound from Fosroc’s well-known Concure range. It is supplied ready to use as a one-component, white, acrylic-emulsion-based liquid that needs no on-site mixing or thinning. When sprayed onto green concrete, the water in the emulsion flashes off and the acrylic resin coalesces into a thin, continuous film over the surface. That film acts as a temporary barrier against evaporation, holding the mix water inside the concrete during the critical first days when the cement is hydrating and the slab is gaining most of its strength.

Proper curing is one of the most under-managed steps on Indian sites. In Delhi NCR and across the plains, surface temperatures on a freshly cast slab can climb well past 40 degrees C in summer, with low humidity and site winds pulling water out of the top layer faster than the concrete can bleed it back. The result is a weak, dusty, crazed surface and avoidable plastic-shrinkage cracking. Traditional curing – ponding, wet hessian or sand – is effective in theory but hard to police, water-hungry, and almost impossible to maintain evenly on large industrial floors. A spray-applied compound like Concure AC standardises curing into a single, fast, verifiable operation: one pass of a knapsack or airless sprayer immediately after finishing, and the slab is sealed.

Concure AC belongs to Fosroc’s acrylic Concure family, which is built around acrylic emulsion / acrylic-resin chemistry rather than the older wax or chlorinated-rubber compounds. Acrylic films are valued because they form quickly, do not yellow appreciably in sunlight, and are generally more compatible with later trades such as tile adhesives, screeds and acrylic-based coatings than wax-based curing membranes. Because Concure AC is white-pigmented, it also reflects solar radiation and gives the applicator an easy visual check that every square metre has been coated. Fosroc positions the product as a cost-effective curing solution that, beyond water retention, helps develop concrete strength, lowers the risk of crack formation and improves the abrasion resistance of the finished surface. Space Arc Engineering supplies Concure AC as an authorised Fosroc distributor, with technical support on coverage, application and the correct grade for your specific floor build-up.

The technical insight

A curing compound is judged on one number above all others: water-retention efficiency, measured to ASTM C156 (or the equivalent AS3799 / BS 7542 test). Acrylic curing membranes in this Fosroc family typically achieve around 90 percent water retention – meaning that under standardised test evaporation, a coated slab loses only about a tenth of the moisture an uncoated one would. That is what lets the upper few centimetres of concrete keep hydrating instead of drying out. Internationally, white-pigmented liquid membrane-forming compounds of this kind are classified under ASTM C309 as Type 2 (white), and the white Concure variants in Fosroc’s catalogue are declared to ASTM C309 Type 2, Class A. The single most important field variable is timing: the film must go down in the narrow window after surface bleed water has evaporated but before the concrete dries – applying too early dilutes the membrane into the bleed water, too late and evaporation damage is already done. The second variable is coverage uniformity; the membrane only retains water where it is continuous, so the rate of roughly 5 square metres per litre (confirm against the current local TDS) must be applied evenly, not flooded in some areas and starved in others.

Where it is used

• Curing of ground-bearing and suspended RCC floor slabs in warehouses, factories and logistics parks
• Curing of cement-based floor screeds and toppings before tiling or coating
• Curing of dry-shake (metallic and non-metallic) hardened floor surfaces immediately after final power-trowelling
• Curing of concrete pavements, hardstandings, ramps and external paving
• Curing of podium decks, terraces and large horizontal pours where wet curing is impractical
• Curing of mass and structural concrete elements indoors and outdoors
• Reducing plastic-shrinkage and early drying-shrinkage cracking on hot, windy sites

Key advantages

• Ready to use, single-component liquid – no mixing, thinning or batching errors on site
• Sprays on in a single fast coat, replacing labour-intensive hessian, sand or ponding curing
• High water-retention efficiency promotes fuller cement hydration and more uniform strength gain
• Reduces the risk of plastic and drying-shrinkage cracking, important in hot, dry Indian climates
• White pigment reflects heat and gives a clear visual check of full, even coverage
• Helps improve abrasion resistance and reduces surface dusting on finished floors
• Acrylic chemistry generally compatible with many subsequent acrylic-based after-trades
• Saves curing water – relevant where water is scarce or expensive on large floor projects

Limitations & considerations

• Membrane curing compounds can interfere with the bond of later toppings, tile adhesives, paints or coatings – removal by light grinding or scabbling is often required before bonded overlays
• Direct-stick timber or parquet flooring is not recommended over acrylic curing membranes
• Effectiveness depends entirely on correct application timing and even coverage; over- or under-application reduces water retention
• White film leaves a visible residue, so it is not suited to surfaces that must remain a clear or decorative as-cast finish
• Not a substitute for a curing membrane where a permanent sealer, hardener or waterproofing system is the real requirement
• Always confirm grade, exact coverage, water-retention class and after-trade compatibility against the current country-specific Fosroc TDS before specifying

Selection & best practice

Specifications

Industry use cases

How we position Fosroc Concure AC

Concure AC sits in the value, ready-to-use tier of Fosroc’s curing range. Within Fosroc itself, step up to Concure WB / Concure WB309 or the Concure A range for specific water-retention or compliance needs, to Concure 1315 (Clear/White) where an ASTM C1315 cure-and-seal with better gloss and after-life is wanted, or to Concure AB White where an explicit ASTM C309 Type 2 Class A acrylic is specified; pair it with Fosroc dry-shake hardeners (Lockcrete / Nitoflor range) on industrial floors. Comparable competitor products include Sika Antisol range and SikaCem curing compounds, MYK Laticrete / MBS curing compounds, Dr. Fixit Pidicure, and STP (Shalimar) curing membranes. Honest guidance: any of these acrylic/wax membrane compounds will cure concrete well if applied at the right time and rate – choose Concure AC when you want a proven, cost-effective, single-component white acrylic curing compound backed by Fosroc’s data sheets and Space Arc Engineering’s local technical support, and reserve cure-and-seal or specialist grades for floors that need a permanent surface finish rather than curing alone.

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