Fosroc Dekguard PU100
Single-component, water-based aliphatic polyurethane anti-carbonation coating that shields concrete and masonry from CO2, chlorides and UV — supplied and applied across Delhi NCR and Pan-India by Space Arc Engineering.
What is it?
A single-component, water-based aliphatic polyurethane protective and decorative coating from Fosroc, engineered primarily as an anti-carbonation barrier for concrete and masonry.
Where is it used?
Exposed RCC facades, car park decks and soffits, sea walls and coastal structures, internal and external concrete and masonry, and enclosed areas where solvent coatings are unsuitable.
Why use it?
It slows carbonation-driven reinforcement corrosion, resists chlorides and sulphates, stays UV-stable without chalking or fading, and — being water-based — is low-odour and safe for poorly ventilated spaces.
How is it applied?
Onto clean, sound, repaired concrete by brush, roller or airless spray, typically in two coats over a prepared (and where needed primed) surface to build a continuous protective film.
About Fosroc Dekguard PU100
Fosroc Dekguard PU100 is part of the long-established Dekguard family of anti-carbonation and protective coatings, positioned as the water-based, single-pack polyurethane option in the range. Carbonation is one of the most common causes of premature deterioration in Indian reinforced concrete: atmospheric carbon dioxide reacts with the alkaline cement matrix, lowers the pore-water pH, and destroys the passive film that normally protects embedded steel. Once the carbonation front reaches the reinforcement, corrosion begins, the steel expands, and the concrete cracks and spalls. Dekguard PU100 is designed to interrupt that cycle by forming a continuous, low-permeability film on the concrete surface that sharply restricts the ingress of carbon dioxide, chloride ions, sulphates, oxygen and rainwater while still allowing the substrate to breathe and release internal moisture vapour.
What distinguishes Dekguard PU100 within the Dekguard line is its chemistry and presentation. It is a single-component, aliphatic polyurethane that cures by reaction with atmospheric moisture and is dispersed in water rather than solvent. The aliphatic backbone is the same chemistry used in premium exterior topcoats and is the reason the coating is genuinely UV-stable — it does not yellow, chalk or fade under strong Indian sunlight the way aromatic polyurethanes and many acrylics do. Because it is water-based, it is low-odour, lower in VOCs and suitable for application in enclosed and poorly ventilated areas such as basement car parks and plant rooms, where solvent-borne coatings are difficult to use safely. The coating dries to a low-gloss, decorative finish and is available in a range of colours, so it doubles as both a protective and an architectural finish.
For specifiers in India, Dekguard PU100 should be understood as a step up from the standard acrylic Dekguard products in chemical and weathering durability, while remaining easier and safer to apply than the two-pack solvent-based Dekguard PU. It is most often specified for car park structures, coastal and marine-adjacent concrete, bridges, flyovers, water-retaining structures and exposed building facades where long-term protection against carbonation and chloride attack is the priority. As an authorised Fosroc distributor and applicator, Space Arc Engineering supplies Dekguard PU100 with the correct primers and ancillary repair products and can advise on the full specification rather than the coating alone.
The technical insight
The performance of an anti-carbonation coating is governed by its resistance to CO2 diffusion, usually expressed as an equivalent air-layer thickness (the diffusion-equivalent thickness of still air the film represents). Across the Dekguard polyurethane platform Fosroc cites a carbon-dioxide diffusion coefficient in the order of 1.0 x 10-7 cm2/s, which corresponds to a high diffusion-resistance barrier — the property that lets a film only tens of microns thick perform like a far thicker layer of air against CO2. The aliphatic polyurethane chemistry of Dekguard PU100 is what delivers the combination that is hard to achieve together: a tight barrier to aggressive gases and ions, genuine UV stability, and adequate water-vapour permeability so the substrate can dry out rather than trap moisture behind the film. The single-component, water-borne formulation removes the on-site mixing ratio errors and pot-life pressure of two-pack systems, but means film build per coat is modest, so achieving the specified dry film thickness reliably depends on applying the correct number of coats at the correct spreading rate over a properly prepared, blowhole-free surface — under-application is the most common cause of disappointing field performance.
Where it is used
- Anti-carbonation protection of exposed reinforced concrete facades, columns and soffits
- Basement and multi-storey car park decks, beams and soffits (low-odour, water-based application in enclosed areas)
- Sea walls, jetties, harbour structures and other coastal concrete exposed to chlorides and spray
- Bridges, flyovers and elevated road structures subject to atmospheric carbonation and de-icing/marine chlorides
- External and internal coating of concrete and masonry on commercial and institutional buildings
- Decorative-protective finish on plant rooms, sewage and effluent structures and industrial concrete requiring chemical and UV resistance
Key advantages
- Effective anti-carbonation barrier — restricts CO2 ingress and increases the service life of structures under carbonation attack
- UV-stable aliphatic polyurethane — does not fade, yellow or chalk under strong sunlight, retaining colour and finish
- Resists chlorides and sulphate ions plus a wide range of chemicals, suiting coastal and aggressive environments
- Water-based and low-odour — environment-friendly and safe to apply in enclosed or poorly ventilated areas such as car parks
- Single-component — no mixing ratios or pot-life management, reducing on-site error compared with two-pack systems
- Breathable film allows entrapped water vapour to escape while keeping liquid water and aggressive ions out
- Decorative low-gloss finish available in a range of colours, combining protection with architectural appearance
- Easy hand or spray application by brush, roller or airless spray with minimal surface preparation
Limitations & considerations
- Modest film build per coat — the specified number of coats and spreading rate must be respected to reach the required dry film thickness
- Performance depends heavily on substrate preparation; blowholes, laitance and surface defects must be filled and removed first to achieve a continuous film
- Not a structural repair or crack-bridging membrane on its own — active cracks and spalled concrete must be repaired (e.g. with Renderoc/Nitomortar) before coating
- Water-based curing is sensitive to ambient conditions; application below the minimum recommended temperature or onto damp/contaminated surfaces compromises film formation
- Not a substitute for a deck waterproofing or trafficable membrane where vehicular wear and water ponding occur — pair with an appropriate deck system
- Exact published figures vary by region and revision; the current local Fosroc technical data sheet should govern coverage, DFT and cure values for any specification
Selection & best practice
Treat Dekguard PU100 as the final layer of a system, not a standalone fix. First repair all defective concrete and reinstate cover with the appropriate Fosroc repair mortar, then make good blowholes and pinholes with a fairing coat so the surface is dense and continuous. Ensure the substrate is clean, sound and dry, removing laitance, curing compounds, dust and biological growth — light grit blasting gives the best key. Apply the recommended primer where the substrate or specification calls for it, allow it to dry fully, then apply Dekguard PU100 in the specified number of coats (typically two), respecting the published spreading rate so the target dry film thickness is actually achieved; using a contrasting shade between coats helps confirm unbroken coverage. Observe the minimum application temperature, avoid application when rain or condensation is imminent, and verify wet/dry film thickness during work. Always confirm coverage, DFT, recoat and cure times against the current local Fosroc technical data sheet for the project, and involve the Fosroc distributor or technical team for car park, marine and chloride-exposure specifications.
Specifications
| Product type | Single-component, water-based aliphatic polyurethane protective / anti-carbonation coating |
| Primary function | Anti-carbonation barrier coating for concrete and masonry; protection against chlorides, sulphates, oxygen and water |
| Finish / appearance | Low-gloss decorative finish, available in a range of colours; UV-stable |
| Curing | Single-pack, moisture/air cure (no on-site mixing of components) |
| CO2 diffusion coefficient (Dekguard PU polyurethane platform) | Order of 1.0 x 10-7 cm2/s (high CO2 diffusion resistance) |
| Typical reference DFT (two-pack Dekguard PU, for comparison) | 50–75 microns dry from 95–145 microns wet per coat |
| Substrates | Concrete and masonry (external and internal); also used over steel and fully cured epoxies within the Dekguard PU range |
| Application methods | Brush, roller or airless spray |
| Number of coats | Typically 2 coats over prepared (and where required primed) surface |
| Key benefits | Anti-carbonation, UV-stable, chloride/sulphate resistant, breathable, water-based / low-odour for enclosed areas |
| Note on figures | Exact coverage, DFT and cure values for PU100 vary by region/revision — confirm against current local Fosroc TDS |
Industry use cases
Commercial & Institutional Car Parks
Coating exposed concrete soffits, beams and columns in basement and multi-storey car parks; the water-based, low-odour formulation allows safe application in enclosed, poorly ventilated decks while providing anti-carbonation and chloride protection.
Coastal & Marine Infrastructure
Protecting sea walls, jetties, harbour structures and coastal buildings in cities like Mumbai, Chennai and along the Indian coastline, where chloride-laden air and spray accelerate reinforcement corrosion.
Bridges, Flyovers & Transport Structures
Anti-carbonation and anti-chloride coating on RCC piers, girders and decks exposed to urban pollution and traffic spray, extending service life and reducing repair frequency.
Commercial Building Facades
Combined protective and decorative finish on exposed concrete and masonry elevations, retaining colour under strong sunlight thanks to the aliphatic, UV-stable polyurethane chemistry.
Industrial & Water-Retaining Structures
Durable coating for plant rooms, effluent and sewage structures and other concrete exposed to chemical attack, where chemical resistance and breathability are both required.
Frequently asked questions
What exactly is Fosroc Dekguard PU100?
How is Dekguard PU100 different from Dekguard PU and Dekguard Standard?
Where is Dekguard PU100 typically used in India?
Does Dekguard PU100 need a primer and how many coats are required?
Is Dekguard PU100 waterproof or a trafficable car park deck coating?
What are credible alternatives to Dekguard PU100?
Can Space Arc Engineering supply and apply Dekguard PU100 across India?
How we position Fosroc Dekguard PU100
Within the Fosroc Dekguard range, Dekguard PU100 occupies the middle ground between the everyday acrylic anti-carbonation coatings (Dekguard Standard, Dekguard S and Dekguard ACE) and the heavy-duty two-pack solvent-based Dekguard PU used for sewage works, chemical plants and submerged or anti-graffiti duty. PU100’s appeal is that it delivers polyurethane-grade UV stability and chemical resistance in a single-pack, water-based form that is far easier and safer to apply in enclosed spaces. For a complete specification it is normally paired with Fosroc primers and, where concrete repair is needed first, with the Renderoc and Nitomortar repair-mortar systems and Nitobond bonding aids — Space Arc routinely supplies these together as a system rather than as isolated products. Against the wider Indian market, credible alternatives a consultant might evaluate include Sika’s Sikagard anti-carbonation coatings, MBS (MB Solutions) protective coatings, Dr. Fixit’s decorative-protective coating range, and STP Limited’s protective and waterproofing systems; the right choice depends on the exposure class, the need for genuine aliphatic UV stability, and whether the application environment rules out solvent-borne products. Where low odour, enclosed-area application and long-term colour retention all matter at once — typically car parks, coastal concrete and exposed facades — Dekguard PU100 is one of the stronger fits, and Space Arc can advise on the full system rather than the coating in isolation.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.