Sika Antisol A-4 White
A white-pigmented, ready-to-use acrylic curing membrane that reflects solar heat and seals mix water into freshly placed concrete, curbing plastic shrinkage cracking on sun-baked slabs.
What is it?
A water-dispersed acrylic copolymer curing compound carrying a white pigment. Sprayed onto green concrete, it dries to a continuous film that both holds back evaporation and bounces sunlight off the surface.
Where is it used?
Large, sun-exposed pours where later surface treatment is planned – highway and airfield pavements, industrial floor slabs, bridge decks, podiums and terraces across Delhi NCR and pan-India projects.
Why use it?
It gives you proper hydration on hot, windy days without armies of labour flooding and hessian-covering the slab, and its acrylic film accepts subsequent paints, plasters and polymer mortars.
How is it applied?
Spray, brush or roller a single even coat as soon as the surface sheen disappears after final trowelling; protect the fresh film from rain for 2 to 3 hours.
About Sika Antisol A-4 White
Concrete does most of its useful hydration in the first day or two after placing, and that only happens if the mix water stays in the slab long enough for the cement to react. On an open Indian site in May, a freshly floated slab can lose that water to sun and wind faster than bleed water can rise, and the result is the familiar map of plastic shrinkage cracks, a dusty weak skin and lower surface strength. Sika Antisol A-4 White is the answer to that problem: a ready-to-use acrylic curing compound you spray straight onto the green concrete, where it forms a thin continuous membrane that seals the surface against premature evaporation.
What sets the A-4 White apart from a plain resin curing compound is the white pigment carried in the film. That pigment reflects a large share of incoming solar radiation, so the slab runs cooler through the critical early hours and the thermal gradient between a baking top surface and the cooler core is reduced. Cooler, slower-drying concrete cracks less. Because the binder is an acrylic copolymer rather than a wax, the cured film stays compatible with later finishes – acrylic paints, polymer-modified mortars and plasters bond to it without the debonding risk you get from wax-based membranes. It is supplied ready to use in 230 kg drums and should never be diluted.
The technical insight
The mechanism is two effects working together. First, the acrylic dispersion coalesces on the drying surface into a low-permeability film that physically blocks moisture escape, so free water stays available for cement hydration instead of evaporating – this is what curbs plastic shrinkage cracking, surface dusting and the soft top skin. Second, the white pigment raises the surface albedo. A grey slab absorbs most of the solar spectrum and can climb well above ambient temperature; a white-reflective film sends much of that radiation back, holding down peak surface temperature and the top-to-core thermal gradient that drives early-age cracking. Meeting ASTM C309 Type 1 Class B means it is a clear-to-white liquid membrane with a defined maximum moisture-loss limit, so the water retention is a specified performance figure, not just a claim. The pigment burns or wears off under traffic and weathering over time, and the acrylic chemistry keeps the surface receptive to overcoating – the two reasons specifiers pick A-4 White over a wax emulsion where the deck will later be painted or screeded.
Where it is used
- Sun-exposed highway, road and airfield concrete pavements poured in high ambient temperatures
- Large-area industrial and warehouse floor slabs where flooding-and-hessian curing is impractical
- Bridge decks, flyover slabs and other infrastructure surfaces exposed to direct sun
- Commercial roof decks, podium slabs and terraces that will later be waterproofed or tiled
- Concrete surfaces scheduled to receive acrylic paints, polymer-modified mortar, screed or plaster
- External residential slabs, driveways and pavements requiring a coatable cured finish
- Precast and site-cast elements where uniform early-age hydration is critical to strength
- Hot, windy Delhi NCR and pan-India pours where labour-based wet curing cannot keep pace with evaporation
Key advantages
- White pigment reflects solar heat, lowering surface temperature and thermal-cracking risk on exposed slabs
- Ready to use – no dilution, mixing or batching, so application error on site is minimal
- Complies with ASTM C309, Type 1, Class B for specified moisture retention
- Acrylic film stays compatible with later acrylic paints, polymer-modified mortars and plasters
- Replaces labour-intensive ponding and hessian-watering, cutting curing water and manpower
- Reduces plastic shrinkage cracking, surface dusting and the weak top skin on hot pours
- Sprays, brushes or rollers on quickly over large areas by a small crew
- Improves early-age hydration, supporting better surface strength and durability
Limitations & considerations
- It is a single-purpose curing membrane, not a water-reducer or admixture – it does nothing inside the mix
- The white pigment is a temporary aid; it weathers and abrades off and is not a permanent decorative or protective coating
- On surfaces to receive certain adhesives, tile-bed mortars or coatings, the film may need mechanical removal or a compatibility check first
- Effective curing depends on applying at the right moment – too early into bleed water or too late after the surface dries reduces performance
- Fresh film needs protection from rain for 2 to 3 hours; a shower before it sets can wash it off
- Coverage varies widely with wind, humidity and temperature, so site trials are needed to fix real consumption
Selection & best practice
Apply as soon as the surface water sheen disappears after final trowelling – typically within roughly half an hour to two hours depending on the weather – because the membrane only works if it seals water in before evaporation has already dried the top skin. Use a low-pressure spray for an even, unbroken film over large pours; a brush or roller suits smaller areas or already-hardened concrete. Do not dilute the product, and stir or agitate the drum before use so the white pigment stays uniformly dispersed. Establish real coverage with a site trial under your actual wind, humidity and temperature rather than assuming the datasheet figure, and keep the fresh film protected from rain for 2 to 3 hours. Where the slab will later be tiled, screeded or bonded with adhesives, confirm compatibility – or plan to mechanically abrade the film – before finishing.
Specifications
| Product type | Water-dispersed acrylic copolymer, white-pigmented concrete curing compound |
| Appearance / colour | Milky white liquid, applied as a white-pigmented film |
| Standard compliance | ASTM C309, Type 1, Class B |
| Coverage / consumption | 5 to 6.5 m² per litre, depending on wind, humidity and temperature |
| Application method | Spray, brush or roller onto green or hardened concrete |
| Rain protection | Protect fresh film from rain for 2 to 3 hours after application |
| Dilution | Ready to use – do not dilute |
| Packaging | 230 kg drum |
Industry use cases
Roads & Highways
Curing sun-exposed pavement-quality concrete on carriageways and airfield aprons, where the reflective white film limits peak surface temperature and keeps early hydration uniform across long open pours.
Industrial Flooring
Sealing large warehouse and factory floor slabs cast in summer, giving proper cure without flooding the bay – and leaving a surface that later accepts screeds, polymer mortars or floor coatings.
Infrastructure & Bridges
Protecting bridge decks and flyover slabs against thermal cracking during the critical first hours in direct sun, on structures where labour-based wet curing is hard to sustain.
Commercial & Roofing
Curing podium slabs, roof decks and terraces that are destined for waterproofing or tiling, using the acrylic film’s compatibility with later polymer-modified and coated finishes.
Residential Projects
Curing external terraces, driveways and pavements on housing sites where a coatable, paint-ready cured surface is wanted without round-the-clock hessian watering.
Frequently asked questions
What is the coverage of Sika Antisol A-4 White?
How is it different from a plain or wax-based curing compound?
Does it meet any standard?
When exactly should it be applied?
Can I tile or screed over concrete cured with Antisol A-4 White?
How is it supplied and does it need mixing?
How we position Sika Antisol A-4 White
Sika Antisol A-4 White sits at the reflective, coatable end of Sika’s Antisol curing range. Where you do not need heat reflection or the white finish, the standard Sika Antisol A-4 (clear acrylic) covers routine curing at lower cost, while other Antisol grades suit resin-based or wax-based needs. As a Sika distributor and applicator we also pair it with Sika’s admixture and repair lines – Sikament and SikaPlast superplasticisers to control the mix that you are curing, and Sika MonoTop repair mortars where cured surfaces later need patching. Across our other brands, Fosroc’s Conplast admixtures and Renderoc repair mortars, and MC-Bauchemie and Dr. Fixit curing and waterproofing products, give consultants alternatives on approved-vendor lists. If your specification calls for Fosroc, the closest counterpart is below.
Fosroc Concure WB — Specify the Fosroc option when the job runs on a Fosroc-approved vendor list or you want a white wax-emulsion curing membrane and the slab will not later be painted or screeded over.
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