Fosroc Nitoproof ET Slurry
Solvent-free coal-tar epoxy anti-skid waterproofing wearing course for bridge decks, jetties and trafficked structural decks.
What is it?
A solvent-free, multi-component coal-tar epoxy resin and aggregate slurry that cures to a flexible, waterproof, anti-skid wearing surface bonded directly to the structural deck.
Where is it used?
Road and foot bridge decks, RO/RO linkspans, jetties and loading platforms, ship and helicopter decks, multi-storey car park decks, airfield aprons and wet industrial floors, on steel, concrete, asphalt or timber.
Why use it?
It combines a waterproof membrane and a hard-wearing trafficable surface in a single thin, lightweight application, eliminating a separate wearing course while delivering grip even when wet.
How is it applied?
After priming with Nitoprime, the trowel-applied slurry is laid at roughly 3 mm and Dynagrip aggregate is broadcast into the wet film to build a 3-4.75 mm anti-skid finish that takes foot traffic in 24 hours and vehicle traffic in 48 hours.
About Fosroc Nitoproof ET Slurry
Fosroc Nitoproof ET Slurry is a specialist waterproofing-cum-wearing system from Fosroc’s bridge and marine deck range, supplied and applied in Delhi NCR and across India by Space Arc Engineering as an authorised Fosroc distributor and applicator. The product belongs to Fosroc’s long-established “ET Slurry” family (formerly marketed as Cicol ET Slurry, and closely related to Nitoflor ET Slurry), built around a solvent-free coal-tar epoxy resin loaded with mineral fillers and graded aggregate. Where most waterproofing coatings are designed only to keep water out, Nitoproof ET Slurry does two jobs at once: it forms a continuous, flexible, fully bonded waterproof barrier over the structural deck, and at the same time provides a tough, abrasion-resistant, anti-skid running surface that carries pedestrian and vehicular traffic directly. That dual function is why it is specified on bridge decks and similar exposed structures where a thin, lightweight, durable system is needed instead of a heavy asphalt or screed overlay. Because the resin is solvent-free and the cured film is chemically resistant and rated for zero spread of flame, it suits enclosed and safety-sensitive structures such as RO/RO linkspans, ship and helicopter decks, jetties, multi-storey car parks and wet industrial areas. The slurry bonds to steel, concrete, asphalt and timber after appropriate priming, making it versatile across the mixed substrates found on real bridge and marine projects. For Indian contractors, consultants and infrastructure clients, it offers a globally proven deck-waterproofing approach from a brand with strong local availability and technical support.
The technical insight
The core of Nitoproof ET Slurry is a coal-tar-modified epoxy. The epoxy backbone delivers adhesion, chemical resistance and toughness, while the coal-tar fraction adds water resistance, flexibility and economy – a combination that has been the workhorse of bridge-deck waterproofing for decades. It is supplied as a multi-component (base resin, hardener and pre-weighed graded aggregate) solvent-free system; the absence of solvent means there is no shrinkage on cure and the full applied thickness is retained as functional film. After the components are blended, the material has a pot life of only about 30 minutes, so it must be mixed in working quantities and laid promptly. The slurry is trowel-applied at roughly 3 mm, giving a theoretical coverage near 3.0 litre/m2 at that build, and Dynagrip anti-skid aggregate is broadcast into the wet film (net aggregate around 3.7 kg/m2) to create the final 3-4.75 mm textured surface, with the higher end of that range used where heavier or faster traffic is expected. Curing is staged: the surface accepts foot traffic after about 24 hours and full vehicular traffic after about 48 hours at normal temperatures, with chemical resistance developing as cure completes. The cured system behaves as a flexible membrane that accommodates minor deck movement and thermal cycling rather than a rigid screed, which is critical on structures that flex and expand. Surface preparation and priming with the appropriate Nitoprime grade (for example Nitoprime 25 on concrete) are integral to performance, since the membrane’s durability is only as good as its bond to a clean, sound, dry substrate.
Where it is used
- Waterproofing and anti-skid surfacing of road and highway bridge decks
- Footbridge and pedestrian walkway decks requiring slip resistance when wet
- RO/RO linkspans and ferry ramps in marine and port infrastructure
- Jetties, loading platforms and cargo handling decks
- Ship decks and helicopter landing decks
- Multi-storey and rooftop car park deck waterproofing
- Airfield aprons and other heavy-duty trafficked surfaces
- Wet-process and chemically aggressive industrial floor areas
- Steel, concrete, asphalt and timber decks needing a thin lightweight overlay
Key advantages
- Dual function – a single thin system provides both the waterproof membrane and a trafficable wearing course
- Lightweight build (3-4.75 mm) avoids the dead load of asphalt or concrete overlays on bridges and decks
- Anti-skid surface that retains excellent grip even when wet, helping prevent aquaplaning
- Solvent-free formulation – no cure shrinkage and lower odour/VOC during application
- Flexible cured film accommodates deck movement and thermal cycling without cracking
- Excellent adhesion to steel and concrete, plus asphalt and timber after correct priming
- Chemically resistant and rated for zero spread of flame, suiting marine and enclosed structures
- Fast return to service – foot traffic in about 24 hours, vehicle traffic in about 48 hours
- Seamless, jointless finish that eliminates the leak paths of sheet-membrane laps
Limitations & considerations
- Very short pot life of about 30 minutes demands disciplined batch mixing and an experienced applicator team
- Contains coal-tar epoxy – dark colour only (typically black/grey) and not suited where light or decorative finishes are required
- Requires thorough surface preparation and the correct Nitoprime primer; bond and performance suffer on damp, contaminated or weak substrates
- Curing and pot life are temperature-sensitive, which needs planning in extreme Indian summer or monsoon conditions
- Not a self-levelling decorative floor topping – it is a functional deck waterproofing and wearing system
- Coverage figures are theoretical; site wastage and substrate texture reduce practical yield, so trial areas are advisable
- Coal-tar chemistry can carry handling, health and environmental restrictions in some specifications, so check current project and regional requirements
Selection & best practice
Treat the system as a bonded membrane, not just a coating. Prepare the deck by grit-blasting or scabbling to a clean, sound, laitance-free profile, ensure it is dry and free of oil, and prime with the correct Nitoprime grade for the substrate while the primer is still tacky. Because pot life is only around 30 minutes, mix in small working batches and have enough applicators to lay and broadcast aggregate before the slurry stiffens. Lay the slurry at the specified build (around 3 mm), broadcast Dynagrip aggregate evenly into the wet film to the project anti-skid rate, and select the 3-4.75 mm thickness band to match the actual traffic. Protect freshly applied work from rain and standing water, respect the 24-hour foot / 48-hour vehicle traffic windows, and always run a site trial to confirm coverage, texture and adhesion on the specific substrate before committing to the full deck.
Specifications
| Product type | Solvent-free coal-tar epoxy resin and aggregate anti-skid waterproofing slurry |
| Chemistry | Coal-tar modified epoxy with mineral fillers (multi-component) |
| Function | Combined waterproof membrane and anti-skid wearing course |
| Compatible substrates | Steel, concrete, asphalt, timber (after priming) |
| Recommended primer | Nitoprime (e.g. Nitoprime 25 on concrete) |
| Pot life | Approx. 30 minutes |
| Applied / slurry thickness | 3 – 4.75 mm depending on traffic |
| Slurry coverage | Approx. 3.0 litre/m2 at 3 mm thickness (theoretical) |
| Anti-skid aggregate | Dynagrip aggregate broadcast, approx. 3.7 kg/m2 net (5.5 kg/m2 gross) |
| Cure – foot traffic | Approx. 24 hours |
| Cure – vehicle traffic | Approx. 48 hours |
| Colour | Dark (black / grey) |
| Pack size | Supplied in 20 litre packs (multi-component) |
| Shelf life | 12 months in dry store, original unopened packs |
| Fire performance | Zero spread of flame (per Fosroc literature) |
Industry use cases
Highway & bridge infrastructure
Waterproofing and anti-skid surfacing of new and refurbished road bridge decks, where the thin lightweight build avoids adding dead load while sealing the structural slab against water and chloride ingress.
Ports & marine
RO/RO linkspans, ferry ramps, jetties and cargo decks where a chemically resistant, slip-resistant, salt-water-tolerant trafficable membrane is required.
Defence & aviation
Helicopter decks, airfield aprons and hardstanding areas needing a durable, fuel-resistant, non-slip deck finish with fast return to service.
Car parks & commercial decks
Multi-storey and rooftop car park decks where a flexible, waterproof, vehicle-trafficked surface protects the structure and provides grip in wet conditions.
Industrial & process plants
Wet-work and chemically aggressive floor areas and platforms requiring a seamless, chemically resistant, anti-skid waterproof surface over steel or concrete.
Frequently asked questions
What exactly is Fosroc Nitoproof ET Slurry?
Where is it typically used?
What thickness and coverage should I plan for?
How long before the deck can take traffic?
Does it need a primer and surface preparation?
Can Space Arc Engineering supply and apply it in India?
How we position Fosroc Nitoproof ET Slurry
Nitoproof ET Slurry sits in Fosroc’s bridge and marine deck waterproofing niche, where it competes more on its combined waterproofing-plus-anti-skid wearing function than on price. Within the Fosroc range it shares its coal-tar epoxy ET Slurry technology with Nitoflor ET Slurry (the industrial-flooring sibling) and the legacy Cicol ET Slurry, and is typically used alongside Nitoprime primers and Dynagrip aggregate; for projects needing only a membrane without a trafficked aggregate finish, Fosroc alternatives such as Nitoproof 600/600WB or the Nitocote ET range may be more appropriate, while heavy structural repair would pair it with the Renderoc and Nitomortar families. Against the wider market, the closest credible alternatives are Sika’s bridge-deck waterproofing systems (for example the Sikalastic and Sika tar-epoxy deck ranges), MBS / MYK / MC-Bauchemie deck membranes, STP Limited bituminous and polyurethane deck systems, and, for lighter or building-level waterproofing, Dr. Fixit – though Dr. Fixit is generally positioned for general construction and roof waterproofing rather than trafficked structural bridge decks. The honest takeaway for specifiers is that Nitoproof ET Slurry is a strong, proven choice where you genuinely need a thin, lightweight, anti-skid, chemically resistant trafficable deck membrane; where the requirement is purely a hidden waterproof layer, a UV-stable decorative finish, or a light-coloured surface, a different Fosroc or competitor product will often be the better fit, and the final selection should follow project loading, exposure and the consultant’s specification.
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