STP ShaliCure PA M 5
Paraffin-based, white-pigmented membrane curing compound that locks hydration moisture into freshly placed concrete and cuts plastic-shrinkage cracking.
What is it?
A ready-to-use, non-flammable paraffin wax emulsion that dries to a white moisture-retaining film on fresh concrete, conforming to ASTM C309 Type 2, Class A.
Where is it used?
Interior and exterior slabs, roads, pavements and structural concrete, plus resealing of old concrete surfaces.
Why use it?
It retains the mix water that cement needs to hydrate, so early-age strength develops fully and surface cracking, spalling and dusting are reduced.
How is it applied?
Spray or roller-apply a single uniform coat onto finished concrete once the surface sheen disappears; no ponding, hessian or mechanical wetting is needed.
About STP ShaliCure PA M 5
Proper curing decides whether a concrete surface reaches its design strength or quietly loses 20-30 percent of it to premature moisture loss. In the heat and wind that dominate most Indian pours, the top few millimetres of a slab can dry out within hours of finishing, leaving a weak, dusty, crack-prone crust long before the cement below has finished hydrating. STP ShaliCure PA M 5 addresses this by forming a continuous paraffin-wax membrane over the fresh surface the moment it is applied, holding the water in the concrete rather than relying on labour to keep hessian or ponds wet for a week.
The compound is a white-pigmented, water-based emulsion that you apply straight from the drum with a spray lance or roller. As it dries, the emulsion breaks and leaves a white film that both seals in moisture and reflects a portion of solar heat, keeping surface temperatures more even. Because it conforms to ASTM C309 Type 2, Class A, its moisture-retention performance is a measured value, not a claim: independent ASTM C156 testing caps water loss at less than 0.55 kg per square metre over 72 hours. For contractors, that translates into reliable curing on large paved areas without the water, manpower and scheduling headaches of traditional wet curing.
The technical insight
Cement hydration is a chemical reaction that only continues while free water is present in the matrix. Stop the water supply early and the reaction stalls, so the concrete never develops the strength, density or abrasion resistance it was designed for. Wet curing works by continuously replacing evaporating water; membrane curing works by preventing that evaporation in the first place. ShaliCure PA M 5 does this with a paraffin wax dispersed as an emulsion. Sprayed onto the surface, the emulsion breaks as the carrier water flashes off and the wax particles coalesce into a thin, semi-continuous film that dramatically slows vapour transmission out of the concrete. The retained moisture keeps the cement hydrating internally, driving early strength and reducing the tensile stresses that cause plastic-shrinkage cracking. The white pigment does two jobs: it makes the coated area visible so applicators can see missed patches, and it reflects solar radiation, moderating the thermal gradient near the surface. The trade-off inherent to any wax membrane is bond: the same film that seals moisture in also sits between the concrete and anything applied later, which is why toppings, screeds, epoxy and adhesives must never go over an intact wax coat.
Where it is used
- Curing of ground-floor and suspended concrete slabs immediately after power-float or trowel finishing
- Curing of concrete roads, highways, runways and large paved areas where wet curing is impractical
- Curing of structural elements such as columns, beams and walls once formwork is struck
- Curing of precast and industrial concrete units in yards and casting beds
- Curing of canal linings, retaining walls, kerbs and other extensive civil-works surfaces
- Resealing and dust-proofing of existing, mature concrete floors and hardstandings
- Curing in hot, dry or windy site conditions where evaporation-driven cracking is a high risk
- Curing of concrete that will remain exposed rather than receive a bonded overlay
Key advantages
- Conforms to ASTM C309 Type 2, Class A, with moisture loss held below 0.55 kg/m2 over 72 hours (ASTM C156)
- Eliminates the water, labour and supervision that continuous wet or hessian curing demands
- White film makes coverage visible during spraying and reflects solar heat off the slab
- Non-flammable water-based emulsion, safer to store and handle than solvent-based membranes
- Single-coat spray or roller application covers large areas quickly
- Also seals and dust-proofs old concrete, promoting fuller cement hydration at the surface
- Compatible with many paints, adhesives and resilient floor coverings once cured
- Resistant to yellowing, so exposed surfaces keep a cleaner appearance
Limitations & considerations
- The wax film blocks bond, so it must not be used where concrete toppings, screeds, epoxy or urethane coatings or adhesives will follow
- Not a substitute for good concrete practice; it cannot correct a poor mix, over-finishing or bleed-water problems
- Must not be applied over bleed water or free-standing water, or the film will not form correctly
- Should not be applied below 4 degrees C ambient, and the material itself must be warmed to at least 10 degrees C before use in cold weather
- Shelf life is limited to 6 months in the original sealed drum, so stock should be rotated
- On badly worn or porous old concrete a single coat may not seal uniformly and a second application can be needed
Selection & best practice
Time the application to the concrete, not the clock: coat the surface as soon as the free-water sheen disappears after finishing, so you trap moisture at its peak. Before spraying, stand the drum upside down for at least two hours, roll it back and forth about ten times, then stir with an electric paddle for two minutes to redisperse the wax. Apply one even coat with a hand pump-up sprayer or airless unit; for roller work use a short-nap, solvent-resistant sleeve and avoid pulling the film thin. Keep the surface clean and free of standing water, and never coat over bleed water. Allow four to six hours drying before foot or wheel traffic. Above all, confirm the finished surface will stay exposed. If any bonded topping, tile bed, epoxy or coating is planned, either omit the wax membrane on those areas or budget for full mechanical removal (grinding or shot-blasting) before the follow-on work.
Specifications
| Product type | Paraffin-based, white-pigmented emulsion membrane curing compound |
| Standard conformity | ASTM C309, Type 2, Class A |
| Physical appearance | White-colour liquid |
| Theoretical coverage | 4-5 m2/L on textured concrete; 5-6 m2/L on smooth concrete |
| Drying time | Max. 4 hours (surface-dependent) |
| Moisture loss (ASTM C156) | < 0.55 kg/m2 in 72 hours |
| Specific gravity | 1.04 +/- 0.2 |
| pH | > 6 |
| Packing / shelf life | 20 kg and 200 kg drums; 6 months in sealed condition |
Industry use cases
Highways & Pavements
Cures long stretches of road, runway and paved concrete in a single spray pass, protecting surfaces against shrinkage cracking without hauling curing water to site.
Commercial & Industrial Floors
Locks in hydration moisture on power-floated warehouse and factory slabs, reducing surface dusting and helping the floor reach full abrasion resistance.
Infrastructure & Water Retaining
Suited to canal linings, retaining walls and large civil surfaces where continuous wet curing is impractical and evaporation losses are high.
Precast Yards
Provides consistent, labour-light curing for precast and cast-in-place units in open casting beds exposed to sun and wind.
Repair & Resurfacing
Reseals and dust-proofs mature concrete floors and hardstandings, restoring a cleaner, harder wearing surface on existing slabs.
Frequently asked questions
Can I apply tiles, screed or epoxy over ShaliCure PA M 5?
How much area does one drum cover?
When exactly should it be sprayed after casting?
Does it meet a recognised curing-compound standard?
Is it safe to store and handle on site?
Can it cure in cold weather?
How we position STP ShaliCure PA M 5
Within the STP ShaliCure range, PA M 5 is the entry paraffin membrane; ShaliCure PA M 10 and the pigmented PA M 20 offer heavier films for more demanding curing, while acrylic-based grades such as ShaliCure Acrylate WB 10 suit surfaces that must later take coatings or overlays without a de-bonding wax layer. Where a specifier wants an acrylic curing membrane from a different house, or is pairing curing with Fosroc repair and admixture systems already on the job, our Fosroc curing compounds are the natural cross-reference. For projects that need a bonded topping afterwards, steer away from any wax membrane and talk to us about resin or acrylic curing alternatives from Fosroc, Sika or Dr. Fixit instead.
Fosroc Concure WB — Choose Concure WB when a project standardises on Fosroc’s repair and admixture ecosystem and wants a comparable water-based wax-emulsion curing membrane from the same brand family.
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