Fosroc Nitobond PVA
Multipurpose PVA bonding agent, surface sealer and cement-gauging admixture for plaster keying, granolithic floor repairs and interior tiling.
What is it?
A single-component, water-based polyvinyl acetate (PVA) polymer emulsion that works as a multipurpose adhesive, porous-surface sealer and cement-mortar gauging liquid. It dries to a transparent film with a typical specific gravity of 1.0 and contains no chloride admixtures.
Where is it used?
Interior and protected building works across India – plaster and render bonding, granolithic and screed floor repairs, tile and acoustic-board fixing, dust-proofing friable screeds, and stone resurfacing. Not for continuously wet, immersed or external rain-exposed locations.
Why use it?
It improves the adhesion and durability of cement mortars and renders, reduces hacking and mechanical keying, seals dusty porous substrates and is economical and easy to brush, roll or spray – a cost-effective workhorse where a true structural epoxy or all-weather SBR bond is not required.
How is it applied?
Diluted with clean water at task-specific ratios (1:1 priming, 1:5 to 1:15 sealing) and brushed onto a sound, clean substrate, or gauged into a 1:1 to 1:2.5 cement:sand key/repair mortar at 1 part Nitobond PVA to 3 parts water. Repair coats are placed onto the still-tacky primer and cured like normal cementitious work.
About Fosroc Nitobond PVA
Fosroc Nitobond PVA is one of the longest-serving bonding agents in the Fosroc Nitobond family and a familiar name on Indian sites wherever plaster, screed or tile work needs a reliable, low-cost key. It is supplied as a ready-to-use white viscous liquid based on a polymerised polyvinyl acetate (PVA) resin emulsion. Being a single-component product, there is no second-pack mixing – it is simply diluted with clean water to the ratio the task calls for, or gauged directly into a cement-sand mortar. On drying it forms a clear, non-toxic, non-flammable film that both seals porous substrates and dramatically improves the bond and abrasion resistance of cementitious toppings.
The product wears several hats on a single site. As a neat adhesive it bonds an unusually wide spread of common building materials – concrete, bricks, stone, render, plasterboard, ceramic and quarry tiles, cork, polystyrene, timber, glass, textiles and more. As a plaster and render bonding agent it provides an adhesive or mechanical key that reduces the need for hacking the substrate. As a cement admixture it is gauged into repair mortars for concrete and granolithic floors, stair-tread levelling, crack and hole filling, and the bonding of new granolithic toppings to old sub-concrete. It also doubles as a dust-proofer for friable screeds and as an anti-bleed primer before over-coating bitumen with oil-based paints.
For Space Arc’s customers in Delhi NCR and across India, Nitobond PVA fills a specific and very practical niche: the high-volume, budget-conscious internal repair and finishing work where epoxy and SBR systems would be over-specified. It is, however, a PVA – the chemistry that defines both its value and its limits, as set out below.
The technical insight
The single most important technical fact about Nitobond PVA is that it is a polyvinyl acetate emulsion, and PVA films are re-emulsifiable – they soften and can re-wet when exposed to prolonged moisture. This is why Fosroc’s own datasheet explicitly states it must NOT be used as a bonding agent in continuously wet or immersed areas, and recommends the SBR-based Nitobond SBR for those conditions. PVA is therefore a moisture-sensitive, interior-grade bonding chemistry, fundamentally different from the styrene-butadiene rubber (SBR) latex in Nitobond SBR or the two-part epoxy in Nitobond EP, both of which give water-resistant, structural bonds. Verified properties from the Fosroc TDS: appearance white viscous liquid; specific gravity typically 1.0 at 20 C; chloride content nil to BS 5075 (so it will not contribute to reinforcement corrosion); compatible with all types of Portland cement. The working chemistry is straightforward – the diluted emulsion penetrates and seals the substrate, while the primer coat is kept tacky (never allowed to fully dry) so the fresh mortar or render bonds into it. Resulting mortars and toppings are cement-based and must be cured like any concrete; in Indian summer conditions above 35 C the material should be shaded and mixed with cool water to control flash-drying of the bond coat.
Where it is used
- Bonding agent (key) for gypsum, lightweight gypsum and anhydrous plasters, reducing the need to hack the substrate
- Priming and key-coat for cement renders and heavier cementitious toppings over masonry and concrete
- Repairs to concrete and granolithic floors – crack/hole filling, resurfacing of worn floors and levelling of worn stair treads
- Bonding new granolithic toppings to existing sub-concrete
- Surface sealing of porous and dusty substrates such as breeze, foam, slag and lightweight blockwork
- Fixing ceramic, quarry, clay, terrazzo, cork, wood-block, lino, polystyrene and acoustic tiles/boards
- Repair and resurfacing of natural and reconstructed stone
- Dust-proofing of friable concrete floors and cement screeds
- Anti-bleed primer before over-coating bitumen surfaces with oil-based paints
- General-purpose multipurpose adhesive across building trades
Key advantages
- Single-component, ready-to-use liquid – no two-pack mixing, just dilute or gauge as required
- Genuinely multipurpose – one product serves as adhesive, sealer and cement admixture
- Bonds an unusually wide range of common construction materials
- Improves the durability, adhesion and abrasion resistance of mortars and renders
- Excellent low-cost dust-proofer and porous-surface sealer
- Contains no chloride admixtures (nil chloride to BS 5075) – safe around steel reinforcement
- Compatible with all types of Portland cement
- Easy to apply by brush, roller or spray and easy to clean with water before set
- Non-toxic and non-flammable; economical for high-volume interior work
Limitations & considerations
- NOT for continuously wet, immersed or water-contact areas – PVA re-emulsifies; use Nitobond SBR instead
- Not a structural bonding agent – for load-bearing or high-strength bonds use an epoxy such as Nitobond EP
- Must not be used outdoors in rain; heavy rainfall before final set causes surface scour
- Do not apply when temperature is below 5 C and falling; protect from frost at all times
- Sets by evaporation – must be protected from moisture during the setting period
- Will not bond polythene, PVC, rubber or similar low-energy/non-porous materials
- Priming coat must be kept tacky and never allowed to fully dry before the next coat, or it must be re-primed
- Short shelf life of 6 months (per UAE TDS) compared with many cement-based products
- Performance depends heavily on thorough substrate preparation and cleanliness
Selection & best practice
Always start with a sound, clean, dust-free substrate – remove laitance, old mortar, paint, oil, algae and loose material by wire-brushing, scabbling or grit-blasting, and degrease where needed. Seal porous or dusty surfaces with a dilute coat (commonly 1 part Nitobond PVA to 10-15 parts water; up to 1:5 for very absorbent blockwork), and pre-soak highly absorbent lightweight blocks first. Apply the priming coat at 1:1 with water, brush it well into all crevices, and lay the repair mortar or render onto it while it is still TACKY – never let the prime coat dry out; if it does, re-prime. Gauge key/repair mortars at 1 part Nitobond PVA to 3 parts clean water. Crucially, confirm the location is interior and will stay dry: if it can get wet, immersed or rained on, switch to Nitobond SBR; if a structural or high-strength bond is needed, switch to Nitobond EP. In hot Indian conditions (above 35 C) store in shade, mix with cool water, and cure finished mortars promptly with damp hessian, polythene or a curing membrane.
Specifications
| Product type | Multipurpose PVA (polyvinyl acetate) polymer adhesive, sealer & cement admixture |
| Base / chemistry | Single-component polymerised PVA resin, water-based emulsion |
| Appearance | White viscous liquid; dries to a transparent film |
| Specific gravity | Typically 1.0 at 20 C |
| Chloride content | Nil (to BS 5075) |
| Cement compatibility | Compatible with all types of Portland cement |
| Sealing dilution | 1 part PVA : 15 parts water (porous); up to 1:10 for highly porous surfaces; 1:5 for very absorbent blockwork |
| Priming dilution | 1 part PVA : 1 part water (applied tacky) |
| Mortar / key-coat gauging | 1 part PVA : 3 parts water, mixed into 1:1 to 1:2.5 cement:sharp sand |
| Key/render coat thickness | Approx. 6 mm average per key coat |
| Tack / open time (neat adhesive) | 20 to 30 minutes (temperature dependent); set in 24 hours |
| Coverage – sealer coat | 75 m2 at 1:15; 50 m2 at 1:10; 25 m2 at 1:5 (theoretical, per unit) |
| Coverage – primer coat | 5 m2 at 1:1 (theoretical) |
| Coverage – key coat | 3 m2 at 1:3 (theoretical) |
| Minimum application temperature | Do not apply below 5 C and falling; older TDS cites not below 7 C (45 F) |
| Pack sizes | 25 and 200 litre drums (UAE TDS); 20 L pail & 210 L drum (Indonesia TDS) |
| Shelf life | 6 months in dry, unopened original packs (UAE TDS); 12 months per Indonesia TDS |
| Storage | Dry conditions, original sealed containers, protect from frost |
| Flammability | Non-flammable |
Industry use cases
Residential & commercial finishing
Plaster and render bonding over masonry and RCC to cut down on hacking, and as an adhesive key when re-plastering patchy internal walls.
Flooring & screeds
Repairing cracks and holes in granolithic and cement floors, resurfacing worn floors, levelling worn stair treads, and bonding new granolithic toppings to old sub-concrete.
Tiling & internal fit-out
Sealing and priming before fixing ceramic, quarry, clay and terrazzo tiles, and adhering cork, lino, wood-block, polystyrene and acoustic boards in dry interiors.
Industrial & warehouse floors
Dust-proofing friable, dusting cement screeds and worn concrete floors in covered, dry areas to bind loose surface fines.
Heritage & stone restoration
Priming and gauging lean repair mortars for resurfacing natural and reconstructed stone where colour matching and low strength are acceptable.
Surface preparation & coatings
Anti-bleed primer over bitumen-coated surfaces prior to applying oil-based paints, preventing staining and bleed-through.
Frequently asked questions
Is Fosroc Nitobond PVA waterproof or suitable for wet areas?
What is the difference between Nitobond PVA, Nitobond SBR and Nitobond EP?
What is the correct dilution ratio for Nitobond PVA?
What coverage can I expect from Nitobond PVA?
Which materials will Nitobond PVA NOT bond?
What pack sizes and shelf life does Nitobond PVA have in India?
How we position Fosroc Nitobond PVA
Within the Fosroc range, Nitobond PVA is the entry-level, interior-only member of the Nitobond bonding-agent family. It is positioned squarely below Nitobond SBR (a styrene-butadiene latex for water-resistant and external bonding plus mortar modification) and Nitobond EP (a two-part epoxy for structural, high-strength new-to-old concrete bonding). The correct decision rule is simple: if the area can get wet or is outdoors, step up to Nitobond SBR; if the bond must be structural or high-strength, step up to Nitobond EP; if it is a dry interior keying, sealing or dust-proofing job on a budget, Nitobond PVA is the economical choice. It naturally pairs with Fosroc repair mortars (Renderoc range) and curing membranes (Concure) on the same site. Against the wider Indian market, comparable PVA bonding agents include Sika Latex / SikaTop products from Sika, the bonding aids in the MYK Laticrete and MBS (MB Solutions) ranges, Dr. Fixit Pidicrete / Bondex from Pidilite, and STP (Shalimar) bonding agents – though buyers should note that several of these competitor white-bottle products are SBR/acrylic rather than true PVA, which changes their wet-area suitability. Space Arc Engineering, as an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India, supplies genuine Nitobond PVA and can advise on whether PVA, SBR or EP is the right specification for your substrate and exposure conditions.
Related Concrete Repair products
Source Fosroc Nitobond PVA for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.