About Dr. Fixit Super Latex

Dr. Fixit Super Latex — sold under Pidilite’s internal code 302 — is one of the oldest and most recognised SKUs in the Dr. Fixit “Building Repairs” range, and it has stayed on site shelves across Delhi NCR for a simple reason: it does three unglamorous jobs that every renovation and repair site needs done. As a bond coat it stops fresh plaster or concrete from separating from an old substrate. As a gauging liquid it turns a patching mortar into a polymer-modified repair mortar that resists the shrinkage cracking plain cement mortar is prone to. And brushed on in two coats over a cement slurry, it works as a light-duty waterproofing layer for small areas — a sunken bathroom slab, a chajja, a lift pit — before the final screed or plaster goes over it.

At Space Arc we position Super Latex firmly as a repair and bonding product first, waterproofing product second. It is not a substitute for a proper roof or terrace waterproofing membrane system on large exposed areas — for that we specify Dr. Fixit’s dedicated roof and below-ground ranges. Where Super Latex earns its place is inside a repair scope: patching spalled RCC members, closing structural-movement plaster cracks, priming a rebar before re-concreting, or bonding a tile/stone cladding bed — jobs where its film-forming SBR chemistry, not membrane thickness, is doing the work.

The technical insight

SBR latex works by co-curing with the cement paste rather than sitting on top of it. As the water in the emulsion evaporates and the cement hydrates, the styrene-butadiene polymer particles coalesce into a continuous film that threads through the cement matrix, bridging the micro-cracks and capillary pores that plain cement mortar relies on aggregate grading alone to resist. That is why the TDS reports a slant-shear bond strength of 5 N/mm² and calls out improved flexural strength and reduced drying/ageing shrinkage as the headline benefits, rather than a hydrostatic-head waterproofing rating — this is a bonding and toughening polymer first. The 42–44% non-volatile matter (solids content) sets how much film actually forms per coat, which is why the TDS specifies two coats for the 70–80 sq. ft./kg coverage figure rather than relying on a single pass. A pH of 7–9 keeps the latex compatible with the alkaline environment of fresh cement without destabilising the emulsion, and the “excellent” freeze-thaw rating (largely a formulation-stability spec rather than a site-relevant one in most of India) confirms the latex won’t separate on cold storage during winter transport.

Where it is used

• Bond coat between old and new concrete, or plaster-to-plaster, before re-plastering over brick masonry
• Waterproofing of small roof terraces, sunken toilet/bathroom portions, chajjas, lift pits, balconies and staircases (brush-applied slurry, 2 coats)
• Repair of plaster cracks wider than 5 mm and gaps that open up between masonry and RCC members
• Anti-corrosion coating on cleaned rebar before re-concreting a repaired section
• Fixing and re-fixing slip bricks, tiles, stone and marble cladding beds
• Gauging liquid for polymer-modified patching and concrete repair mortars on spalled columns, beams and slabs
• Salt-petre-free brick masonry plaster base coat
• Bonding coat and mortar additive under tile/panel underlays and special floor finishes

Key advantages

• Multipurpose single product covers bonding, crack repair, rebar protection and light waterproofing
• Improves flexural strength of repair mortar, reducing re-cracking at patch edges
• Reduces drying and ageing shrinkage cracks versus plain cement mortar
• Bonds strongly to concrete, masonry, stone, plaster and steel — most common site substrates
• Low rebound loss as a bonding agent, so less mortar wastage on vertical/overhead repairs
• Improves abrasion and erosion resistance of the finished cement mix
• Economical — 1 kg covers 70–80 sq. ft. in two coats, and it’s sold in packs from 200 g upward for small patch jobs
• Widely stocked and familiar to Indian masons, so no re-training needed on application technique

Limitations & considerations

• Not a standalone waterproofing membrane — it is rated for small-area, low-head situations and must be protected by a screed or plaster overlay, not left exposed long-term
• Repair-mortar and plaster performance depends on strictly keeping the water-cement ratio between 0.4 and 0.45; site teams that eyeball the mix lose the benefit
• Every coat must be applied while the previous coat is still tacky (roughly a 4–6 hour window), which forces a same-day, well-sequenced application — it doesn’t suit a stop-start work schedule
• Surface preparation is non-negotiable: spalled concrete must be saw-cut at the edges and roughened, so it adds labour time on top of material cost
• Intended for cracks wider than 5 mm; it is not the right product for hairline or actively moving structural cracks that need a flexible sealant or injection system
• Shelf life is limited to about 18 months in a sealed pack, so bulk-buying beyond a project’s timeline risks wastage

Selection & best practice

Specifications

Industry use cases

How we position Dr. Fixit Super Latex

Within the Dr. Fixit range, Super Latex sits alongside Pidiproof LW+ (integral/surface waterproofing compound, typically specified for the finishing plaster coat that follows a Super Latex bond coat) and the dedicated Dr. Fixit crack and roof-waterproofing systems that Space Arc uses for larger exposed terraces and roofs — Super Latex is deliberately the repair-and-bonding workhorse, not the primary membrane. For a Fosroc-based alternative, specifiers who standardise on the Fosroc Nitobond range can substitute Nitobond SBR, a comparable SBR bonding-and-repair latex; a specifier already running Fosroc’s Renderoc or Nitomortar repair mortar system might prefer it purely for single-brand compatibility on a mixed-vendor site, though performance-wise the two SBR latices serve the same bonding-and-repair role. Space Arc supplies and applies both families across Delhi NCR and can advise on whichever fits the project’s existing specification.

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