STP ShaliCure Acrylate WB 10
A water-based, white-pigmented acrylic curing membrane that locks moisture into fresh concrete for full cement hydration, verified to ASTM C 309 and ASTM C 1315.
What is it?
A single-pack, water-based acrylic curing compound from STP that sprays or brushes onto fresh concrete and dries to a white film sealing in mixing water.
Where is it used?
Industrial floors, bridges, canals, reservoirs, pavements and slabs where fresh concrete must cure without premature drying.
Why use it?
Retains moisture so cement hydrates fully, giving stronger, less dusty, crack-resistant surfaces without labour-heavy ponding or wet hessian.
How is it applied?
Stir, then apply one thin, even coat by low-pressure spray or roller once the concrete has set, leaving no dry spots. No dilution.
About STP ShaliCure Acrylate WB 10
STP ShaliCure Acrylate WB 10 is a ready-to-use, water-based curing compound built on an acrylic copolymer and carrying a white pigment. When applied to freshly finished concrete it forms a continuous, moisture-retaining film that holds the mix water inside the slab through the critical first few days. That water is exactly what the cement needs to hydrate; lose it too early to sun and wind and you get a weaker, dustier surface prone to plastic and drying-shrinkage cracks. In the heat of an Indian summer, where a slab can dry out long before conventional curing gets going, a sprayed film like this is often the difference between a floor that performs and one that fails inspection.
The white pigment does two useful jobs. During application it shows the crew exactly where the compound has and has not landed, so coverage can be checked by eye rather than guessed. Once cured, that same white surface reflects a meaningful share of incident sunlight, keeping the concrete cooler and easing thermal stress on young concrete. The product conforms to ASTM C 309 (Type 2, Class B) and ASTM C 1315 (Type II, Class A), so it is genuinely a specification-grade membrane rather than a general-purpose sealer, and it is compatible with many paints, adhesives and resilient floor coverings applied later.
The technical insight
Curing is not about wetting concrete from the outside; it is about not letting the water already inside escape before the cement has consumed it. ShaliCure Acrylate WB 10 works on that second principle. The emulsion is sprayed on as a milky liquid, the water carrier evaporates, and the acrylic solids knit into a thin continuous membrane bonded to the surface. That film has very low water-vapour transmission, so the STP data records a water loss of only 0.025 to 0.032 percent over 72 hours, which is what keeps the internal relative humidity high enough for hydration to continue. The high surface reflectance of 62 to 68 percent lowers peak surface temperature, reducing the thermal gradient between a hot skin and cooler core that drives early cracking. Because the membrane is acrylic and pigmented white rather than wax-based, it also breaks down more predictably under UV and is friendlier to subsequent coatings and adhesives than many resin or wax curing films.
Where it is used
- Curing of freshly cast industrial and warehouse floor slabs
- Bridge decks, piers and other infrastructure concrete
- Canals, reservoirs and water-retaining structures
- Highway and airport pavement concrete
- Large ground slabs and rafts poured in hot, windy conditions
- Precast and formwork concrete, applied immediately after stripping
- Any exposed concrete where ponding or wet-hessian curing is impractical
Key advantages
- Water-based and low-odour, so safer to spray than solvent-based curing compounds
- White pigment gives visible confirmation of coverage during application
- High surface reflectance (62-68%) keeps young concrete cooler and reduces thermal cracking
- Meets ASTM C 309 Type 2 Class B and ASTM C 1315 Type II Class A
- Compatible with many paints, adhesives and resilient floor coverings applied later
- Reduces surface dusting and hardens the surface by promoting full hydration
- Fast, single-coat spray or roller application covers large pours quickly
- Ready to use with no mixing of components and no dilution
Limitations & considerations
- Not a decorative or long-term sealer; it is a curing membrane and will weather over time
- A visible white film remains, so it is unsuitable where a clear or tinted finish is required from day one
- Must be applied in a single coat with no dilution; thinning it defeats the moisture seal
- Film integrity depends on even coverage, dry spots left uncoated will cure poorly
- Not intended for surfaces that will receive tightly bonded coatings requiring a fully residue-free substrate without prior checks
- Protect from freezing in storage and do not apply over standing water or contaminated surfaces
Selection & best practice
Bring the drum to a workable state first: stand it upside down for at least two hours, roll it back and forth around ten times, then stir with an electric stirrer for about two minutes so pigment and solids are fully dispersed. The concrete surface must be clean and free of standing water, with any sealer or contaminant removed so the film can grip. On industrial paving, wait until the concrete has started to set, then apply one thin, even coat by low-pressure handheld or airless sprayer, or by roller, at roughly 3.8 to 7.6 m2/kg for spray and 4.5 to 6.5 m2/kg for brush depending on surface texture. On formwork, apply immediately after stripping. Work systematically and leave no dry spots, touching up patchy areas, and never dilute the product. Application temperature should sit between 5 and 50 degrees C. Clean all tools with water at once, before the film hardens.
Specifications
| Type | Water-based, white-pigmented acrylic curing compound |
| Colour | White coloured liquid |
| Standards | ASTM C 309 Type 2 Class B; ASTM C 1315 Type II Class A |
| Theoretical coverage (spray) | 3.8 – 7.6 m2/kg |
| Theoretical coverage (brush) | 4.5 – 6.5 m2/kg |
| Drying time | 180 – 200 minutes at 27 degrees C, 55% RH |
| Reflectance | 62 – 68% |
| Water retention (loss after 72 hrs) | 0.025 – 0.032% |
| Density | 1.20 +/- 0.04 g/cc |
| pH | 6 – 7 |
| Application temperature | 5 – 50 degrees C |
| Packaging | 25 kg and 225 kg sealed drums |
| Shelf life | 12 months, sealed, at 5 – 38 degrees C |
Industry use cases
Industrial Flooring
Curing large power-floated warehouse and factory slabs where uniform hydration reduces surface dusting and delivers a harder, more durable wearing surface.
Infrastructure & Bridges
Sealing moisture into bridge decks, piers and pavement concrete on sites where continuous water curing is impractical over long exposed pours.
Water-Retaining Structures
Curing canals, reservoirs and tank concrete so early-age strength and durability are achieved before the structure is put into service.
Highways & Pavements
Fast single-coat spray curing across long stretches of road and airfield concrete, with the white film aiding coverage checks over large areas.
Precast & Formwork
Applied immediately after stripping formwork to prevent rapid surface drying of freshly demoulded precast units in hot weather.
Frequently asked questions
Do I need to dilute ShaliCure Acrylate WB 10 before spraying?
What coverage should I plan for?
When during the pour do I apply it?
Which standards does it meet?
Will it interfere with floor coatings or adhesives applied later?
What pack sizes and shelf life should I expect?
How we position STP ShaliCure Acrylate WB 10
Within the STP ShaliClass range, ShaliCure Acrylate WB 10 is the water-based, white-pigmented acrylic choice, sitting alongside STP’s paraffin/wax-emulsion curing compounds such as the ShaliCure PA and resin-based grades; pick this one when reflectance, low odour and later coating compatibility matter. Where a project already specifies Fosroc, the equivalent is Concure WB, a water-based white wax-emulsion curing membrane in our Fosroc catalogue. Space Arc also stocks curing compounds and complementary concrete admixtures, surface hardeners and floor coatings across Dr. Fixit, Sika, MC-Bauchemie and Master Builders Solutions, so we can match the curing compound to the downstream flooring or repair system on the same project rather than treating curing in isolation.
Fosroc Concure WB — Specify the Fosroc Concure WB when the project is already standardised on the Fosroc system or a Fosroc-approved curing compound is called for, as it is a directly comparable water-based white-pigmented curing membrane.
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