Fosroc Brushbond
Brush-applied acrylic-cementitious waterproofing that bonds to damp concrete, breathes with the structure and is safe enough for drinking-water tanks.
What is it?
A two-component waterproof coating from Fosroc: Brushbond powder (cements, graded aggregates, additives) mixed on site with Nitobond BB acrylic emulsion and water into a brushable slurry.
Where is it used?
Overhead and underground water tanks, reservoirs, swimming pools, RCC roofs, basements and masonry walls — anywhere a seamless positive-side waterproof barrier is needed.
Why use it?
It grips damp concrete at over 1 N/mm², holds back up to 7 m of positive water head, stays vapour-permeable so trapped moisture escapes, and is non-toxic for potable water contact.
How is it applied?
Two coats by stiff-bristle brush or trowel to roughly 1 mm total thickness; the second coat goes on as soon as the first turns touch-dry.
About Fosroc Brushbond
Fosroc Brushbond is a two-component, acrylic polymer modified cementitious coating that forms a seamless elastomeric waterproof membrane on concrete and masonry. The kit pairs a cement-and-graded-aggregate powder with Nitobond BB acrylic emulsion; only clean water is added at site. Once mixed, it brushes on like a thick paint and cures into a hard-wearing grey or white barrier that also re-faces pitted or honeycombed concrete and seals static shrinkage cracks. A note on the name: many buyers in India search for this material as “Dr. Fixit Brush Bond”, but Brushbond is a Fosroc trademark — Pidilite’s Dr. Fixit range has no product by this name, though it offers comparable coatings we can quote alongside.
Space Arc Engineering supplies Brushbond ex-stock across Delhi NCR, Ghaziabad and Noida, with pan-India project dispatch in both the 23 kg + 4 L industrial kit and the 6 kg + 1 L small pack. As an authorised distributor and applicator, we back every supply with genuine-batch documentation, coverage estimation for your BOQ, and trained application crews for tank, terrace and basement packages where single-point responsibility matters.
The technical insight
Brushbond works because two binder systems cure side by side. The cement fraction hydrates and keys mechanically into the prepared, pre-dampened substrate — which is why the coating actually prefers damp concrete and achieves pull-off adhesion above 1 N/mm². Simultaneously, the acrylic copolymer particles from the Nitobond BB emulsion coalesce into a continuous film threaded through the cement matrix. That film blocks liquid water and slows carbon dioxide and chloride-ion diffusion, yet leaves the coating open enough for water vapour to escape from inside the structure — so it resists the blistering that traps exposed impermeable membranes. Performance under pressure is thickness-driven: the mixed material lays down dense (1.85–1.95 g/cc), and at adequate build it resists positive hydrostatic heads up to 7 m, with a minimum 2 mm coat plus protective screed specified where sustained pressure or loading applies.
Where it is used
- Overhead and underground water tanks and reservoirs, including potable storage
- Swimming pools and water features (positive-side waterproofing beneath finishes)
- Flat RCC roofs and terraces, finished with a protective screed or tiling
- Basement walls and rafts — positive-side damp-proofing of below-grade concrete
- Sunken slabs of bathrooms and utility areas before filling and tiling
- Re-facing pitted, honeycombed or uneven concrete ahead of final finishes
- Sealing static shrinkage cracks in blockwork and masonry walls
- Protective coating on RCC against waterborne salts, chlorides and carbonation
Key advantages
- Adhesion above 1 N/mm² to concrete, bonding to both porous and non-porous substrates
- Applies directly onto damp concrete — no long drying-out period before coating
- Non-toxic when cured, suitable for drinking-water tank interiors
- Breathable film lets internal water vapour escape, reducing blistering and debonding
- Resists positive hydrostatic pressure up to 7 m head at adequate thickness
- Minimal surface preparation and simple brush or trowel placement keep labour costs low
- Good resistance to carbon dioxide and chloride-ion diffusion protects embedded rebar
- Two kit sizes (23 kg + 4 L and 6 kg + 1 L) suit both projects and small repairs
Limitations & considerations
- Pot life is only 30 minutes at 27°C and drops further in Indian summer — mix in small batches and never re-temper with water
- Not for cold-weather placement below 10°C substrate/ambient temperature
- Bridges only static shrinkage cracks; live or moving cracks need an elastomeric PU or modified system instead
- Not a wearing surface — trafficked decks and tank floors under sustained head need a minimum 2 mm coat protected by screed
- Shelf life is 9 months in unopened packs and shorter in humid godowns; Nitobond BB must be protected from freezing
- Alkaline in the wet state — gloves and goggles are mandatory during mixing and application
Selection & best practice
Start with a sound substrate: remove oil, grease, laitance and loose matter, and cut back spalled or disintegrated concrete, reinstating with a Renderoc repair mortar before coating. Moisten the surface — Brushbond performs best on damp (not ponded) concrete. Pour the Nitobond BB into a clean drum, add an equal volume of water for brush consistency, then charge the powder gradually under a slow-speed drill (350–450 rpm) and mix 2–4 minutes until lump-free. Batch only what the crew can place within the 30-minute pot life, and keep the mix stirred while working. Apply with a 100–150 mm stiff-bristle brush in two full coats to build about 1 mm, recoating as soon as the first coat is touch-dry; budget 16–18 m² per industrial kit plus wastage. For tank floors and areas under sustained hydrostatic load, build a minimum 2 mm and lay a protective screed over the cured coating. Wash tools immediately in clean water — hardened material only comes off mechanically.
Specifications
| Supply form | Two-component kit: Brushbond powder (23 kg industrial / 6 kg small) + Nitobond BB acrylic emulsion (4 L / 1 L jerry can) |
| Mixing ratio (brush consistency) | 23 kg powder : 4 L Nitobond BB : 4 L water (small pack 6 kg : 1 L : 1 L) |
| Pot life | 30 minutes at 27°C |
| Mixed density | 1.85–1.95 g/cc at brushable consistency |
| Adhesion to concrete | >1 N/mm² |
| Coverage at 1 mm thickness (two coats) | 16–18 m² per 23 kg + 4 L kit; 4–4.5 m² per 6 kg + 1 L kit |
| Hydrostatic pressure resistance | Positive side, up to 7 m head (minimum 2 mm coat with screed above for heavy duty) |
| Application temperature | Not below 10°C |
| Colours / shelf life | Grey and white; 9 months in unopened packs stored dry |
Industry use cases
Residential & Group Housing
Waterproofing of overhead and underground water tanks, terraces and sunken bathroom slabs in apartment projects, where a potable-safe, damp-tolerant coating shortens handover schedules.
Hospitality & Sports
Positive-side membrane beneath tile finishes in swimming pools, spas and water bodies at hotels, clubs and stadiums, resisting continuous immersion and hydrostatic head.
Commercial & Institutional
Damp-proofing basement retaining walls and lift pits in office, retail and hospital buildings, with the breathable film preventing blistering in humid conditions.
Water Infrastructure
Internal lining of municipal reservoirs, treatment-plant structures and storage tanks where a non-toxic coating and resistance to waterborne corrosive salts are mandatory.
Industrial Plants
Protective anti-carbonation and chloride-barrier coating on process-area RCC, cooling-water structures and plant storage tanks exposed to aggressive service water.
Frequently asked questions
Is Brushbond a Dr. Fixit product?
Can Brushbond be used inside drinking-water tanks?
What coverage should I budget in my BOQ?
Can it go on damp or freshly repaired concrete?
How much water pressure can the coating withstand?
Why did my mix stiffen in the pail before I finished?
How we position Fosroc Brushbond
Within the Fosroc family, Brushbond is the workhorse for tanks, roofs and basements; step up to Brushbond RFX where exposed structural concrete needs a higher-elasticity protective coating, use Renderoc mortars for pre-coating repairs, and consider Proofex sheet membranes for external basement tanking under severe ground conditions. Nitobond BB, the kit’s own emulsion, is also available separately as a bonding aid. From our other brand lines, Dr. Fixit Pidifin 2K and Fastflex are the closest cementitious alternatives, while movement-prone exposed terraces are often better served by PU membranes such as Dr. Fixit Blueseal. Space Arc will help you match the system to the structure rather than force one product everywhere.
Related Waterproofing products
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