Fosroc Nitocote PU Aliphatic
Single-component aliphatic polyurethane topcoat delivering long-term UV stability, gloss retention and chemical resistance over steel, concrete and cured epoxy or PU systems.
What is it?
A single-component, aliphatic polyurethane (PU) protective coating used as a UV-stable finish/topcoat over steel, concrete and previously applied, fully cured epoxy or polyurethane systems.
Where is it used?
Exterior steelwork, plant and equipment, bridges, water-retaining and industrial structures, and coated concrete where colour retention and chemical resistance matter — common across infrastructure, water, oil & gas and commercial projects in India.
Why use it?
Aliphatic PU chemistry resists yellowing and chalking under sunlight, so it keeps its colour and gloss far longer than aromatic PU or epoxy topcoats, while shielding the substrate from salts, mild acids, oil, fuel and bacterial attack.
How is it applied?
Brush, roller or airless spray in two coats at 250–300 microns wet film per coat onto a clean, dry, suitably prepared substrate — curing to 150–180 microns DFT per coat; no separate primer is needed over fully cured epoxy or PU.
About Fosroc Nitocote PU Aliphatic
Fosroc Nitocote PU Aliphatic is a single-component protective coating built on aliphatic polyurethane resin technology, formulated as a high-performance, UV-stable finish coat. In a protective-coating build-up, the role of the topcoat is decisive: it is the layer that faces sunlight, weather and aggressive media, so its job is to lock in the colour, gloss and barrier performance of the system below it. Aliphatic polyurethanes are specified precisely because they hold their appearance — they resist the yellowing, chalking and gloss loss that affect aromatic PU and epoxy finishes when exposed to ultraviolet light. For Indian projects, where structures sit under intense sun, coastal salt-laden air and industrial fallout for years on end, that durability translates directly into longer maintenance intervals and lower whole-life cost. Nitocote PU Aliphatic bonds to a useful range of substrates — structural steel, concrete and, importantly, fully cured epoxy or polyurethane coatings — which lets it serve as the weathering topcoat over an epoxy anti-corrosive or PU intermediate without an additional priming step. It is supplied in white as standard and can be colour-matched to a project’s specification. Because it is a one-pack product, there is no on-site mixing ratio to control, no pot-life clock to race and far less chance of an incorrectly proportioned, under-performing batch — a genuine advantage for applicator crews working at height or in confined plant areas. Space Arc Engineering supplies and applies Nitocote PU Aliphatic as an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India, pairing the product with the correct primer and intermediate layers so the finished system performs as the specification intends.
The technical insight
The defining feature here is chemistry: aliphatic polyurethane versus the cheaper aromatic polyurethane. Aromatic PU films degrade and discolour under UV; aliphatic PU films do not, because their molecular backbone is far more stable to ultraviolet light. That is why Nitocote PU Aliphatic is positioned as the exterior, sun-facing finish rather than a buried coat. Being single-component, it cures by reaction with atmospheric moisture rather than by mixing a base and hardener, which removes mix-ratio and pot-life error but makes it sensitive to ambient humidity and dew during application and cure. The two-coat regime — 250–300 microns wet per coat building to 150–180 microns dry per coat — gives a nominal total dry film thickness in the region of 300–360 microns over two coats, with additional coats specified for severe exposure. The genuinely labour-saving point for a coatings contractor is that, over a fully cured epoxy or PU, no separate primer is required: the topcoat goes straight onto the cured system, cutting one full application cycle from the programme. As always with Fosroc, the country-specific Technical Data Sheet governs exact figures for cure times, overcoat windows, density, VOC and shelf life, and should be obtained for the project location before specification.
Where it is used
- UV-stable weathering topcoat over Fosroc epoxy anti-corrosive systems on structural and architectural steelwork
- Colour-retentive finish coat on exposed concrete that has received an epoxy or PU intermediate
- Protection of plant, tanks, pipework and equipment exposed to salts, mild acids, oil and fuel
- Exterior steel on bridges, gantries, walkways and industrial framing in coastal and high-UV environments
- Refurbishment topcoats over existing fully cured epoxy or PU coatings without re-priming
- Decorative-yet-protective finishes where long-term gloss and colour retention are specified
Key advantages
- Single-component — no mixing ratio, no pot life to manage, lower risk of on-site batching error
- Excellent UV resistance: resists yellowing, chalking and gloss loss for long-term colour retention
- Good chemical resistance to salts, mild acids, oil, fuel and bacterial attack
- Can be applied directly over fully cured epoxy or PU coatings with no separate priming system, saving a labour cycle
- Adheres to multiple substrates — steel, concrete and cured epoxy/PU
- Versatile application by brush, roller or airless spray
- Supplied white with colour-matching capability for specification compliance
Limitations & considerations
- It is a topcoat/finish, not a standalone corrosion-protection system — bare steel and concrete still need the correct primer and intermediate coats beneath it
- As a moisture-curing single-pack PU, it is sensitive to high humidity, dew and damp substrates during application and cure
- Requires a clean, dry, sound and properly prepared surface; cured surfaces must be free of contamination for adhesion
- Not formulated for immersion or aggressive concentrated-chemical service unless verified against the project-specific TDS
- Country/region-specific TDS values (cure times, VOC, density, service limits) must be confirmed for the actual site before use
- Application outside the recommended film-thickness window can compromise UV durability and finish
Selection & best practice
Treat Nitocote PU Aliphatic as the finish layer of a designed system, not a quick fix. Specify it over a Fosroc epoxy primer/anti-corrosive build-up on steel, or over a cured epoxy/PU intermediate on concrete, and confirm the underlying coat is fully cured before overcoating. Prepare the surface to the standard the system demands — abrasive-blast steel to the required cleanliness, and ensure concrete and cured coatings are clean, dry and contamination-free. Apply two coats at 250–300 microns wet film each to achieve 150–180 microns DFT per coat, adding coats for severe exposure as advised. Because it is moisture-curing, avoid application when rain, dew or high humidity is expected within the cure window, and respect the overcoat times in the current TDS. Always obtain and follow the latest country-specific Fosroc Technical Data Sheet and MSDS for the project location, and use trained applicators — Space Arc provides both supply and application support across Delhi NCR and Pan-India.
Specifications
| Product type | Single-component protective coating / finish topcoat |
| Chemistry | Aliphatic polyurethane resin |
| Components | Single component (one-pack) |
| Colour / finish | White as standard; colour-matchable |
| Suitable substrates | Steel, concrete, fully cured epoxies or polyurethanes |
| Application methods | Brush, roller or airless spray |
| Number of coats | Two coats (additional coats for severe exposure) |
| Wet film thickness | 250–300 microns per coat |
| Dry film thickness (DFT) | 150–180 microns per coat |
| UV resistance | Excellent (resists yellowing/chalking) |
| Chemical resistance | Salts, mild acids, oil, fuel and bacteria |
| Priming over cured epoxy/PU | Not required |
| Pack size | 20 litre pails |
Industry use cases
Infrastructure & bridges
UV-stable, colour-retentive topcoat over epoxy anti-corrosive systems on exposed structural steel, gantries and walkways subject to high sun and weathering.
Water & wastewater
Finish coat over protected steel and concrete on treatment-plant structures exposed to salts and mild chemical attack, where long maintenance intervals are valued.
Oil, gas & industrial plant
Protection of tanks, pipework and equipment against oil, fuel and mild acids while retaining a serviceable, recognisable colour-coded finish.
Commercial & industrial buildings
Durable, gloss-retentive finish on exterior steelwork and coated concrete facades where appearance must last in the Indian climate.
Coastal & marine-adjacent assets
Salt-resistant weathering topcoat for steel structures in coastal Delhi-NCR-served projects and Pan-India shoreline sites.
Maintenance & refurbishment
Re-coating of existing, fully cured epoxy or PU systems to restore UV protection and colour without re-priming, reducing downtime.
Frequently asked questions
Is Fosroc Nitocote PU Aliphatic a complete corrosion-protection system on its own?
Why choose aliphatic PU instead of an epoxy or aromatic PU topcoat?
Do I need to prime before applying it over an existing epoxy or PU coating?
What thickness and how many coats should be applied?
What colours and pack sizes are available?
Can Space Arc supply and apply it across India?
How we position Fosroc Nitocote PU Aliphatic
Within the Fosroc protective-coatings range, Nitocote PU Aliphatic sits at the top of the build-up as the UV-stable weathering finish, typically over a Fosroc epoxy anti-corrosive system such as Nitocote EP or an epoxy primer, and it shares the Nitocote family with related polyurethane products like Nitocote UR512 (an aliphatic PU often used as a UV-resistant finish over Fosroc waterproofing membranes such as Brushbond) and Nitocote EPU. Where a project needs the corrosion-barrier layer beneath this topcoat, Fosroc Nitocote EP and Nitoprime products are the natural companions; where it needs waterproofing first, Brushbond/Proofex systems precede it. Against the wider Indian market, credible alternatives in the aliphatic-PU / high-performance topcoat space include Sika (Sikalastic and Sikafloor PU finishes, and Sika’s PU topcoats), MBS (MB-Solutions / MasterProtect-type PU finishes), Dr. Fixit (PU-based protective and roofing topcoats) and STP (Shalimar’s PU coatings) — these are worth evaluating on specified UV durability, chemical-resistance data, colour range and applicator support for the particular asset. The honest positioning is this: Nitocote PU Aliphatic is a strong choice specifically as a single-component, easy-to-apply, colour-retentive exterior finish over an already-protected substrate, and it is most cost-effective when its labour-saving “no re-prime over cured epoxy/PU” benefit is genuinely used. It is not the right product where you actually need the primary corrosion barrier, immersion-grade chemical resistance, or a high-build elastomeric waterproofing layer — those call for the matching system components. Always validate the final selection against the current country-specific Fosroc TDS and the project’s exposure and specification.
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