About Fosroc Cementite

Cementite is Fosroc’s ready-mixed, cement-based waterproof putty coating — a single-component product that comes off the shelf ready to brush, with none of the powder-and-liquid batching that trips up small waterproofing jobs. Applied in two to three coats over concrete or masonry, its cream putty consistency does two jobs at once: it fills the pores, blowholes and fine voids that let water migrate through a wall, and it builds a continuous cementitious film that keeps stored water in and ground dampness out. Because the chemistry is cement-based, the coating is naturally compatible with the substrates Indian construction actually uses — RCC tank walls, brick masonry sumps and plastered bathroom surfaces.

It has earned its place as the straightforward choice for static, crack-free surfaces: domestic overhead tanks, society sumps, basement walls and pond interiors where movement is negligible and a rigid film performs dependably. Space Arc Engineering supplies genuine Fosroc Cementite across Delhi NCR and Pan-India, backed by practical guidance on coat counts, recoat windows and curing — the details that decide whether a cementitious coating actually holds water.

The technical insight

Cementite works through film formation plus pore blocking. The first coat is drawn into the open capillaries of the substrate, where the cement fraction hydrates and locks mechanically into the surface — which is why the product wants a firm, absorbent base rather than a sealed one. Each subsequent coat, laid perpendicular to the previous pass, closes the pinholes any single brush direction leaves behind and thickens the film into a waterproof barrier. The cured result is a rigid mineral coating, and that rigidity defines its limits: hydrated cement has almost no elastic recovery, so a live crack underneath will telegraph straight through the film. The seven-day cure matters because the coating keeps gaining density as hydration continues — pressurise it with stored water too early and you are testing a soft, still-permeable coat.

Where it is used

• Internal waterproof coating of domestic overhead water storage tanks in concrete or masonry
• Waterproof lining of underground sumps and water collection tanks
• Moisture-resistant wall coating in bathrooms, toilets and wet rooms
• Interior face of below-ground basement walls for dampness control
• Concrete interiors of garden ponds and decorative water features
• Small patch and repair coats in swimming pools during the dry season
• Pore-filling finish coat over blowhole-marked concrete in water-retaining structures

Key advantages

• Supplied factory ready-mixed — opens and applies immediately, eliminating site batching errors
• Cream putty consistency fills pores, blowholes and fine voids as it coats
• Cement chemistry bonds naturally to concrete, plaster and masonry substrates
• Applied with an ordinary brush or roller, so regular site painters can handle it
• Multi-coat build creates a continuous waterproof film suited to water-retaining duty
• Smooth, uniform cream finish doubles as a presentable final surface
• Economical and widely stocked for small and mid-sized waterproofing jobs

Limitations & considerations

• Rigid, low-flexibility film — it will not bridge moving or live cracks and is unsuitable over expansion joints
• Not a plugging compound: it cannot stop active water leaks, which must be sealed first
• Needs a full 7 days of curing before the coated surface can hold water
• Waterproofing depends on completing 2–3 full coats; a single coat is not adequate
• Coverage drops on porous substrates, so absorbent surfaces consume noticeably more material

Selection & best practice

Specifications

Industry use cases

How we position Fosroc Cementite

Cementite is the entry point in Fosroc’s water-retaining coatings range: choose it for static, crack-free tanks, sumps and wet areas where simplicity and economy matter most. Where the substrate moves or shows hairline cracking, specify Fosroc Brushbond Flex; for severe leakage-prone structures, the Brushbond RF system offers a heavier-duty cementitious build; and for high-elasticity membrane duty on roofs and podiums, Fosroc Nitoproof 600 is the stronger call. Pair it with Renderoc Plug wherever active leaks must be stopped before coating. Space Arc also stocks comparable cementitious waterproof coatings from Dr. Fixit and Sika — talk to our team if your project specification calls for an alternative brand.

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