Fosroc Concure WB White
Water-based white wax-emulsion curing compound that seals fresh concrete against premature moisture loss, cutting plastic and drying shrinkage on slabs, pavements and bridge decks.
What is it?
A water-based, white wax-emulsion liquid curing compound that is sprayed onto fresh concrete to form a temporary membrane retaining mix water for proper cement hydration.
Where is it used?
Large flatwork such as road and runway pavements, bridge decks, industrial floors, canal linings, and vertical or sloping surfaces like columns, beams, chimneys and walls where pond or hessian curing is impractical.
Why use it?
It removes dependence on scarce water and round-the-clock labour for traditional wet curing, while the white pigment reflects sunlight to keep slab temperatures and shrinkage cracking down in hot Indian conditions.
How is it applied?
Stirred thoroughly, then spray-applied in a single even coat by knapsack or motorised sprayer as soon as the surface sheen of bleed water disappears, at roughly 3.5 to 5.0 m2 per litre.
About Fosroc Concure WB White
Fosroc Concure WB White is a water-based concrete curing compound formulated on a low-viscosity wax emulsion that incorporates an alkali-reactive emulsion system. When sprayed onto a freshly cast cementitious surface, the emulsion “breaks” on contact with the alkaline concrete and instantly knits together into a continuous, non-penetrating film. This film dries from a white wet coat into a thin membrane that physically blocks the escape of mix water through the surface. By holding that water in, the compound lets cement hydration continue uninterrupted during the critical first days, which is precisely when concrete develops most of its early strength and abrasion resistance.
The “White” in the name is functionally important rather than cosmetic. The white pigmentation gives a light-reflectance value above 60 percent, so the freshly applied membrane bounces a large share of incident solar radiation back off the slab. In Delhi NCR summers and across most of India, where deck temperatures on an exposed pour can climb far above ambient, this reflectivity keeps the concrete cooler, reduces the steep moisture-evaporation gradient and suppresses the plastic-shrinkage cracking that hot, windy, low-humidity site conditions otherwise drive. The white coat also doubles as a visual quality-control aid: applicators and inspectors can see at a glance which areas have been coated and which have been missed.
A single application is designed to cover the whole curing period, eliminating the need for ponding, damp hessian, wet sand or polythene sheeting and the continuous water and labour those methods consume. The product is water-based, non-toxic and non-flammable, so it is comparatively safe to store and spray on busy sites. It belongs to Fosroc’s wider Concure range of curing compounds; Space Arc Engineering supplies it as an authorised Fosroc distributor across Delhi NCR and Pan-India alongside complementary admixtures, repair mortars and protective coatings.
The technical insight
The performance of a curing compound is judged by how little water the concrete loses while the membrane is in place, measured under ASTM C156 (water-retention test) and graded under ASTM C309 (liquid membrane-forming curing compounds). Concure WB White is a Type 2 (white pigmented), wax-emulsion compound: published Concure WB / WB30 data in this family records water-retention efficiency around 90 to 91 percent and water loss kept below roughly 0.55 kg/m2, with light reflectance above 60 percent. Two practical consequences follow for Indian site teams. First, timing is everything: the compound must be sprayed the moment free bleed water has disappeared but before the surface dries out; spray too early and you trap a weak laitance layer, too late and irreversible evaporation has already begun. Second, the wax membrane is sacrificial and not a permanent coating. Under UV exposure it gradually breaks down over weeks, and while it is intact the surface can stay slightly tacky, attract dust, and become slippery when wet. Crucially, the wax film is a bond breaker, so if the slab will later receive screeds, toppings, tile adhesive, waterproofing membranes or paint, the residue must be mechanically removed (grinding, shot-blasting or scabbling) or a non-wax curing method specified instead. This single limitation governs most correct/incorrect specification decisions for the product.
Where it is used
- Curing of large-area concrete pavements, highways, airport runways and aprons
- Bridge decks, flyover decks and elevated road slabs exposed to sun and wind
- Industrial and warehouse ground floor slabs (where no bonded topping follows)
- Canal linings, spillways and other water-retaining civil structures
- Vertical and sloping faces of columns, beams, retaining walls and chimneys
- Precast yards and large pours where wet curing with water and hessian is impractical
Key advantages
- Single spray application covers the entire curing period, removing repeated wetting cycles
- Eliminates the need for water, damp hessian, sand or polythene, saving water and labour on site
- White reflective film lowers slab surface temperature and reduces plastic and drying shrinkage cracking
- Water-based, non-toxic and non-flammable, making storage and spraying relatively safe
- White colour gives clear visual confirmation of coated versus uncoated areas for quality control
- Improves early cement hydration, surface hardness and resistance to dusting
Limitations & considerations
- The wax membrane acts as a bond breaker and must be fully removed before screeds, toppings, tile adhesive, coatings or waterproofing are applied
- Sacrificial film degrades under UV over a few weeks and is not a permanent sealer or coating
- Surface can remain tacky, attract airborne dust and become slippery when wet while the membrane is intact
- Application is highly timing-sensitive: must be sprayed after bleed water clears but before the surface dries out
- Minimum application temperature applies (generally not below about 5-10 C); performance suffers in very cold conditions
- Not a substitute for water curing where a clean, bondable surface is a contract requirement
Selection & best practice
Stir the drum thoroughly before use to redisperse any settled wax, then spray a single uniform coat with a knapsack or motorised low-shear sprayer, holding the nozzle about 450 mm from the surface and passing back and forth to avoid thin streaks. Apply on flatwork as soon as the surface sheen of bleed water has gone, and on vertical or formed faces immediately after stripping. Target roughly 3.5 to 5.0 m2 per litre and do not over-thin. Avoid continuous re-circulation through high-shear pumps, which can break the emulsion; use a diaphragm pump for concrete-train work. Importantly, confirm the downstream finish first: where a bonded screed, topping, tile bed, coating or waterproofing will follow, either remove the wax film mechanically before that work or specify a non-wax/water-based dissipating curing method instead. Clean equipment with water immediately after use.
Specifications
| Product type | Water-based wax-emulsion concrete curing compound (white pigmented) |
| Appearance | White emulsion (wet); dries to a continuous white film |
| Standards | ASTM C309 Type 2 (white); ASTM C156 (water retention); AS 3799 Class A Type 2 (Concure WB family) |
| Light reflectance | More than 60% per ASTM C309 (Concure WB / WB30 White measured ~62%) |
| Water-retention efficiency | Approx. 90-91% (Concure WB / WB30 published data); water loss below ~0.55 kg/m2 per ASTM C156 |
| Coverage / yield | Approx. 3.5 to 5.0 m2 per litre, single coat (site-dependent) |
| Drying time | Less than 4 hours |
| Density | Approx. 0.96 kg/L (Concure WB30 White reference value) |
| Non-volatile content | Approx. 31% (Concure WB30 White reference value) |
| Application temperature | Minimum approx. 5-10 C |
| Application method | Single-coat spray (knapsack or motorised low-shear sprayer) |
| Properties | Water-based, non-toxic, non-flammable |
| Packaging | 5 litre, 20 litre and 200 litre drums (Concure WB range) |
| Shelf life | Approx. 9 months stored between 5 C and 35 C in original sealed containers |
Industry use cases
Highways and roads
Curing of long pavement stretches and bridge/flyover decks where the white reflective film cuts solar heat gain and protects against shrinkage cracking in open, windy conditions.
Airports
Runway, taxiway and apron concrete that demands consistent early strength and abrasion resistance over very large exposed areas without round-the-clock water curing.
Water-retaining structures
Canal linings, spillways and channels where ponding the surface for wet curing is impractical and reliable moisture retention is needed.
Industrial and warehouse floors
Ground slabs left as a wearing surface, where the compound improves surface hardness and dusting resistance (used only where no bonded topping or coating follows).
General building and precast
Columns, beams, walls, chimneys and precast units, especially vertical or sloping faces where hessian and water curing are difficult to maintain.
Frequently asked questions
Is Fosroc Concure WB White a permanent coating or sealer?
Can I tile, screed, paint or waterproof over a slab cured with Concure WB White?
Why choose the White grade over a clear curing compound?
What is the coverage and how is it applied?
How does Concure WB White compare with other curing methods and brands?
Does Space Arc supply Concure WB White across India?
How we position Fosroc Concure WB White
Concure WB White sits in Fosroc’s water-based wax-emulsion curing range as the white, high-reflectance option, alongside the clear Concure WB and grades such as Concure WB30, WB200 and WB309; where the slab will receive a bonded finish, a resin-based or water-dissipating curing aid (or membrane-removal step) should be considered instead. Compared with competitor curing compounds such as Sika Antisol, MBS/MBCC equivalents, Dr. Fixit Pidicure and STP curing compounds, it is positioned as a reliable, reflective, single-coat compound for large flatwork and exposed pours in hot climates. Within a project it pairs naturally with Fosroc admixtures (e.g. the Auracast/Conplast plasticiser ranges) used in the same concrete, and with Fosroc repair mortars and protective coatings applied later once any wax film has been removed. The honest caveat that defines its place in a specification is the bond-breaker issue: it is excellent where the cured surface stays exposed, and the wrong choice where a clean, bondable substrate is required without extra preparation.
Related Protective Coatings products
Source Fosroc Concure WB White for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.