Fosroc Nitocote Wallguard Premium
High-build acrylic elastomeric waterproofing-cum-decorative coating for exterior masonry and concrete facades, engineered to bridge hairline cracks and resist wind-driven rain.
What is it?
A single-component, water-based acrylic elastomeric coating that is both a decorative finish and a flexible waterproof membrane for exterior walls. It cures to a tough, breathable film that bridges hairline cracks up to 0.5 mm.
Where is it used?
External masonry, concrete, plaster and cement-sand rendered facades of buildings, especially in high-rainfall and coastal environments where wind-driven rain and dampness are a recurring problem.
Why use it?
It combines waterproofing, crack-bridging flexibility, UV stability, anti-dirt cleanability and microbial resistance in one tintable product, replacing separate paint and waterproofing systems on the facade.
How is it applied?
Surface is prepared, blow-holes filled with a fairing coat, then two coats are applied by brush, roller or spray at a theoretical rate of 3 to 3.5 sqm/litre to build approximately 110 micron DFT, with a 5-6 hour gap between coats.
About Fosroc Nitocote Wallguard Premium
Fosroc Nitocote Wallguard Premium is a high-performance exterior wall coating from Fosroc’s Nitocote protective-coatings range, formulated as a water-based acrylic elastomeric system that performs the twin role of a decorative finish and a flexible waterproof membrane. Where conventional emulsion paint sits on the wall purely as a colour layer, Wallguard Premium is engineered to behave as a continuous, elastic film that keeps wind-driven rain out of the masonry while still allowing internal moisture vapour to escape. It is built from high-quality acrylic polymer combined with weather-resistant pigments and carefully graded fine fillers, which together give the coating its toughness, UV durability and clean, low-dirt-pickup surface. For Indian conditions, where building facades swing between monsoon saturation, intense summer UV and large diurnal thermal movement, this elastomeric behaviour is the core value: the film can stretch to accommodate structural movement and bridge the hairline shrinkage and thermal cracks (up to 0.5 mm) that would otherwise let water track into the wall. The Premium grade in particular is positioned for demanding exposures, carrying explicit microbial resistance against algae, fungi and bacterial attack, resistance to chloride attack, and a wide tintable colour range so architects can specify a protective system without compromising on the elevation aesthetic. It is supplied ready to use, requiring no dilution, and can be applied by brush, roller or spray, which makes it practical for both new construction and re-coating of weathered facades. For contractors and consultants in Delhi NCR and across India, Wallguard Premium offers a single specification line that delivers waterproofing, anti-carbonation-style cover protection, decoration and long-term weatherability on external walls, reducing the number of trades and products needed on the elevation. Space Arc Engineering, as an authorised Fosroc distributor and applicator, supplies the product with the correct base shades and pack sizes, and supports specifiers with substrate assessment, primer/fairing-coat selection and applicator guidance so the system performs to its rated film thickness.
The technical insight
The functional heart of Wallguard Premium is the relationship between film thickness and elongation. The Wallguard system is designed to deliver roughly 110 micron dry film thickness (DFT) over two coats, and at that thickness the acrylic elastomer achieves in excess of 100% elongation (tested to ASTM D412) with crack-bridging capability beyond 0.5 mm (ASTM C836). This is why correct application rate matters more than with ordinary paint: under-application starves the film of the thickness it needs to remain continuous and elastic over a moving crack, so the specified 3 to 3.5 sqm/litre over two coats is a performance requirement, not just a coverage estimate. The film is breathable (water-vapour transmission around 22 gm/sqm/day to ASTM E96), which lets construction and rising moisture escape rather than building vapour pressure behind the coating and causing blistering, while the dense polymer matrix gives a very low rapid chloride penetration rating (ASTM C1202) and resists 1000 hours of accelerated UV weathering (ASTM D4587) without defects. Tensile strength is greater than 2.0 N/sqmm and adhesion to a sound substrate is around 1.3 N/sqmm, both measured on the cured film. Practically, the two limits a site team must respect are temperature and substrate dryness: ambient and surface temperature should be between 10 and 40 degrees C, and the substrate must be genuinely dry, because a water-based emulsion applied onto damp or sub-10-degree surfaces will not coalesce into the intended elastic membrane.
Where it is used
- Exterior wall waterproofing and decoration on RCC, brick and block masonry facades of residential, commercial and institutional buildings
- Coastal and high-rainfall projects where wind-driven rain and salt-laden air cause persistent facade dampness and chloride ingress
- Re-coating and weatherproofing of existing weathered or chalking facades after assessment and surface preparation
- High-rise elevations where facade access is expensive and a long-life, low-maintenance elastomeric finish reduces re-painting cycles
- Cement-sand rendered and plastered surfaces requiring a single tintable system that bridges plaster shrinkage and hairline thermal cracks
- Concrete surfaces needing surface protection with reduced chloride penetration as part of a durability/cover-protection strategy
Key advantages
- Acts as both decorative finish and flexible waterproof membrane, consolidating two trades into one specification
- Bridges hairline cracks up to 0.5 mm and accommodates structural and thermal movement at the rated DFT
- Breathable film lets internal moisture vapour escape, reducing risk of blistering and dampness behind the coating
- Microbial resistance to algae, fungi and bacteria keeps coastal and shaded facades cleaner for longer
- UV stable and proven against 1000 hours accelerated weathering, giving long facade life in Indian sun
- Anti-dirt, low pick-up surface that can be cleaned easily, maintaining elevation appearance
- Resistance to chloride attack and very low chloride penetration, useful in coastal and aggressive exposures
- Ready to use with no dilution, applicable by brush, roller or spray, and tintable across a wide colour range
Limitations & considerations
- Water-based system: must only be applied on dry substrates and within 10 to 40 degrees C ambient/surface temperature
- Performance depends on achieving the correct ~110 micron DFT; under-application at less than the specified rate compromises crack-bridging and waterproofing
- Designed for above-ground exterior walls, not for permanently immersed, hydrostatic-pressure or below-grade tanking applications
- Crack-bridging is rated up to 0.5 mm hairline cracks; structural or live moving cracks need separate crack treatment first
- Blow-holes, pitting and uneven surfaces must first be filled with a cementitious fairing coat (e.g. Renderoc FC) or acrylic putty for a continuous film
- Cementitious fairing/repair coats should be allowed to cure (around 48 hours) before coating, and compatibility trials are advised over existing coatings
- Exposure to moisture in storage greatly reduces the 12-month shelf life; containers must stay sealed in dry warehouse conditions
Selection & best practice
Treat the application rate as a performance spec, not a guideline. Begin with a dry, clean, contamination-free substrate, removing oil, laitance, loose matter and any moss or algae (treat growths with a proprietary biocide first). Fill blow-holes and pitting with a cementitious fairing coat such as Renderoc FC or an acrylic fairing coat, and allow it to cure for around 48 hours. Stir the coating for at least 2 minutes with a slow-speed (300-400 RPM) paddle. Apply the first coat by brush, felt roller or spray, allow 5-6 hours drying at around 30 degrees C, then apply the second coat, holding the overall theoretical rate to 3 to 3.5 sqm/litre over two coats to build the full ~110 micron DFT. Do not apply if substrate temperature is below 10 degrees C or if the surface is damp. Allow up to 7 days for full cure. For warranty-grade results on important facades, use an authorised applicator and document the surface prep, base shade, batch and coats.
Specifications
| Product type | Water-based acrylic elastomeric decorative and waterproof exterior wall coating |
| Nature / components | Single component, ready to use (no dilution) |
| Binder / chemistry | High-quality acrylic polymer with weather-resistant pigments and graded fine fillers |
| Appearance | Emulsion coating; tintable, available in white and dark/midtone bases with a wide colour range |
| Specific gravity | Approx. 1.29 (per Wallguard system data) |
| Theoretical coverage | 3 to 3.5 sqm/litre in two coats (practical coverage varies with substrate porosity) |
| Dry film thickness (DFT) | Approx. 110 microns in two coats |
| Elongation | >100% at 110 micron DFT (ASTM D412-02) |
| Crack bridging | Passes >0.5 mm width (ASTM C836) |
| Tensile strength | >2.0 N/sqmm at 250 micron (ASTM D412-02) |
| Adhesion strength | Approx. 1.3 N/sqmm to sound substrate |
| Breathability (WVT) | Approx. 22 gm/sqm/day (ASTM E96) |
| Accelerated weathering | No defects after 1000 hrs UV exposure (ASTM D4587) |
| Chloride penetration | Very low (Rapid Chloride Penetration Test, ASTM C1202) |
| Number of coats | Two coats |
| Recoat / overcoat time | 5 to 6 hours between coats at approx. 30 degrees C |
| Tack-free / full cure | Tack-free approx. 5-6 hrs; fully cured in 7 days |
| Application temperature | Ambient and surface temperature 10 to 40 degrees C; dry substrates only |
| Application method | Nylon brush, felt roller or spray |
| Pack sizes (Wallguard system) | White base 20, 4 and 1 litre; Dark/Midtone base 19, 3.8 and 0.95 litre |
| Shelf life | 12 months in unopened containers under dry warehouse conditions |
Industry use cases
Residential high-rise & townships
Specified as the exterior elevation system on apartment towers in NCR and coastal cities to waterproof and decorate facades in one operation while bridging plaster shrinkage cracks and cutting repaint frequency.
Commercial & institutional buildings
Used on offices, hospitals and educational campuses where a durable, low-dirt, microbial-resistant facade with a wide colour palette is required to keep elevations clean and presentable.
Coastal & marine-adjacent structures
Applied where salt-laden wind-driven rain drives dampness and chloride into walls; its low chloride penetration and chloride resistance suit coastal exposures from Mumbai to Chennai.
Facade repair & re-coating
Chosen by maintenance contractors to over-coat weathered, chalking or algae-affected facades after biocide treatment and surface prep, restoring both waterproofing and appearance.
Infrastructure & public works
Used on RCC external surfaces of public buildings and utility structures as part of a surface-protection and durability strategy that combines decoration with reduced moisture and chloride ingress.
Frequently asked questions
Is Nitocote Wallguard Premium a paint or a waterproofing coating?
How much area does one litre cover?
Does it need a primer or surface treatment first?
What cracks can it bridge?
What pack sizes and colours are available?
Can it be applied during the monsoon or on a damp wall?
How we position Fosroc Nitocote Wallguard Premium
Nitocote Wallguard Premium sits at the upper end of Fosroc’s acrylic exterior-wall coating family, above the standard Nitocote Wallguard, adding explicit microbial (algae/fungi/bacteria) and chloride resistance for demanding coastal and high-exposure facades. Within the Fosroc range it is commonly specified alongside Nitoprime AW as a substrate primer, with Renderoc FC or Nitocote Putty used as the fairing coat to fill blow-holes, and Nitobond AR where bonding of repairs is involved; for anti-carbonation-grade concrete protection on aggressive structures, specifiers often look at Dekguard-type coatings in the same Fosroc protective range. Against the wider market, credible alternatives an Indian consultant may evaluate include Sika’s elastomeric facade and SikaWall/Sikagard exterior coatings, MBCC/Master Builders Solutions (MBS) facade and elastomeric protective coatings, Dr. Fixit’s Raincoat and Newcoat elastomeric exterior range from Pidilite for the residential and repair segment, and STP’s acrylic exterior waterproofing coatings. Wallguard Premium differentiates on its documented elastomeric performance at a defined DFT (over 100% elongation, >0.5 mm crack bridging, breathable, UV-stable, low chloride penetration) combined with a decorative tintable finish, making it a strong single-line specification where waterproofing, durability and elevation aesthetics must be delivered together. Space Arc Engineering supplies it as an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India, and can advise on the correct primer, fairing coat and complementary Fosroc products for a complete, warrantable facade system.
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