Dr. Fixit Pidicrete MPB (303 Latex)
Pidilite’s acrylic multi-purpose binder — one milky-white latex that works as a bond coat, mortar modifier, rebar primer and curing aid across concrete repair jobs.
What is it?
A single-component acrylic co-polymer emulsion from Pidilite, catalogued as Dr. Fixit Pidicrete MPB (product code 303) and widely ordered on site as 303 Latex. It is a bonding agent and cement-mortar modifier, not a standalone coating.
Where is it used?
Old-to-new concrete joints, spalled RCC repair on columns, beams, slabs, chajjas and parapets, plaster bond coats on smooth shuttered concrete, rebar priming, and tile, slip-brick and marble re-fixing.
Why use it?
Plain cement slurry pulls off smooth RCC; a 1:1 MPB-cement slurry grips it. Verified adhesion to dry concrete is 5-20 N/mm2 (BS 6319 Part 4), it is chloride-free, and one drum replaces four or five single-purpose products.
How is it applied?
Brush or roller. As bonding slurry, mix 1:1 by volume with cement and place the repair or plaster while the coat is still tacky. As a mortar modifier, dose 5-7.5 kg per 50 kg bag of cement with 150 kg washed sand.
About Dr. Fixit Pidicrete MPB (303 Latex)
Dr. Fixit Pidicrete MPB is an acrylic co-polymer latex that most Delhi NCR contractors know by its catalogue number — 303. It answers a problem every site engineer has met: fresh mortar simply does not want to stick to old, smooth or steel-shuttered concrete. Brushed on as a neat primer or mixed 1:1 with cement as a bonding slurry, it converts that slick RCC face into a surface a repair mortar or plaster coat can genuinely key into. The same emulsion doubles as a mortar modifier, a protective primer over cleaned reinforcement, a flexibiliser for cementitious coatings and even a curing aid over finished patches.
Because it is acrylic rather than SBR, the polymer holds up better under UV and alkaline exposure, which matters on external repairs that stay partly exposed. The material carries nil chloride, so there is no corrosion penalty when it sits directly against rebar. Space Arc Engineering supplies Pidicrete MPB from stock in packs from 1 kg jars for small patch gangs up to 225 kg barrels for rehabilitation contracts, with technical support for mix design and application across Delhi NCR and pan-India dispatch.
The technical insight
The mechanism is polymer-cement co-matrix formation. Acrylic co-polymer particles disperse through the mix water; as cement hydrates and draws that water down, the particles coalesce into a continuous elastic film threaded through the hydrate structure. At an old-to-new interface this film bridges the two materials, which is why tested adhesion to dry concrete reaches 5-20 N/mm2 against BS 6319 Part 4 — far beyond what a neat cement slurry manages. Within a modified mortar, the film adds tensile and flexural capacity and plugs capillary pores, which is where the waterproofing improvement comes from when MPB is admixed with cement. The film also retards moisture loss: curing efficiency exceeds 55% to BS 7542:1992, meaning a slurry flash coat over a fresh repair meaningfully slows plastic shrinkage in hot Indian conditions.
Where it is used
- Bonding slurry between old and new concrete in structural repairs to columns, beams, slabs, chajjas and parapets
- Bond coat on smooth shuttered RCC before cement-sand plaster to stop de-bonding and hollowness
- Polymer-modified repair mortars and renders for patching spalled or honeycombed concrete
- Protective priming of cleaned reinforcement steel before reinstatement mortar is placed
- Re-fixing slip bricks, tiles and marble, and polymer-modified bedding mortars
- Cement-admixed waterproof and flexible coatings on roofs, chajjas and parapet tops
- Dust-proof sealing of cementitious floors in stores and utility areas
- Curing aid brushed over fresh repair mortar to limit early moisture loss
Key advantages
- Tested adhesion to dry concrete of 5-20 N/mm2 (BS 6319 Part 4:1984) — a genuine structural-grade bond
- Nil chloride content, so it can prime rebar without accelerating corrosion
- Single component and ready to use — brush it straight on, no site blending of powders
- Modified mortar shows 30-40 N/mm2 dry compressive strength (BS 6319 Part 2:1983) with improved tensile and flexural values
- Acrylic chemistry gives better UV and alkali stability than SBR latexes on exposed external repairs
- One material covers bonding, mortar modification, steel priming, coating flexibiliser and curing duties — leaner site inventory
- Compatible with all common cements, including OPC and PPC used across Indian sites
- Pack range from 1 kg to 225 kg with 18-month sealed shelf life suits both patch gangs and rehab contracts
Limitations & considerations
- It is a bonding agent and modifier, not a membrane — exposed roofs still need a dedicated waterproofing system over it
- The bond coat must receive mortar while tacky; a slurry left to dry hard acts as a de-bonding layer and must be redone
- Performance collapses on poor preparation — laitance, form-release oil and loose material must come off first
- Wet-service compressive strength drops to 25-30 N/mm2 from 30-40 N/mm2 dry, so permanently saturated repairs need conservative design
- As a water-based emulsion, uncured work needs protection from rain and frost, and severe drying conditions call for supplementary curing
- Deep structural spalls need proper repair mortars or micro-concrete; MPB bonds and modifies but does not replace them
Selection & best practice
Preparation decides the result. Remove dust, loose plaster, oil, paint, grease, algae and corrosion deposits; roughen sound but smooth concrete and strip laitance by light scabbling or grit blasting. Expose corroded rebar fully and clean it to bright metal, including the hidden face of bars. Prime steel with two coats of MPB-cement slurry mixed 1:1 by volume, letting each coat dry. For bonding, brush the 1:1 slurry firmly into the substrate and place your repair mortar or plaster while the coat is still tacky — on a warm North Indian afternoon that window can be well under an hour, so mix only what the gang can chase. For repair mortars and renders, batch 50 kg cement with 150 kg washed sand and 5-7.5 kg of Pidicrete MPB, adding just enough water for placing consistency. Finish by curing the repair, using an MPB flash coat to slow moisture loss, and shield uncured mortar from rain and frost.
Specifications
| Composition | Acrylic co-polymer emulsion with additives, single component |
| Appearance | Milky white liquid |
| pH | 7.0 – 8.0 |
| Chloride content | Nil |
| Compressive strength, modified mortar (BS 6319 Part 2:1983) | 30-40 N/mm2 dry; 25-30 N/mm2 wet |
| Adhesion strength to concrete, dry (BS 6319 Part 4:1984) | 5-20 N/mm2 |
| Curing efficiency (BS 7542:1992) | Greater than 55% |
| Theoretical coverage as coating | Approx. 5-7 m2/kg |
| Packaging and shelf life | 1, 5, 10, 20 and 225 kg packs; 18 months in sealed pack, stored cool and dry |
Industry use cases
Housing society rehabilitation
Repair contractors treating spalled chajjas, balconies and parapets use MPB for rebar priming, bonding slurry and modified reinstatement mortar in one material, cutting SKUs on scattered small repairs.
Residential and commercial construction
Plastering gangs in Delhi NCR brush the 1:1 bond coat onto smooth Mivan and steel-shuttered RCC so internal and external plaster stops sounding hollow at columns and soffits.
Industrial plants and warehouses
Maintenance teams patch damaged floor edges and plinths with MPB-modified mortar and seal dusty cementitious floors in stores with a diluted coat.
Institutional and infrastructure maintenance
PWD-style repair works on schools, hospitals and utility structures rely on the chloride-free slurry for old-to-new concrete joints where rebar contact is unavoidable.
Interior fit-out and renovation
Fit-out contractors re-fix loose tiles, slip bricks and marble and improve bedding mortars where hacking the substrate is not an option.
Frequently asked questions
Is Dr. Fixit 303 Latex the same product as Pidicrete MPB?
How is 303 MPB different from Dr. Fixit Pidicrete URP (301)?
What is the mix ratio for a bonding slurry coat?
How much material will my job need?
Can I waterproof a roof with 303 alone?
What happens if the bond coat dries before plastering?
How we position Dr. Fixit Pidicrete MPB (303 Latex)
Pidicrete MPB is the do-everything binder of the Dr. Fixit building-repairs line we stock. For waterproof plaster work and heavier repair duty, Dr. Fixit Pidicrete URP (301), the SBR sibling, is the usual step across, while Dr. Fixit Super Latex (302) serves general-purpose bonding on tighter budgets. Pair MPB repairs with Dr. Fixit Pidiproof LW+ where the new concrete itself needs integral waterproofing. On specification-driven projects, Space Arc also supplies Fosroc Nitobond AR (acrylic) and Nitobond SBR bonding agents and the Renderoc repair mortar range, plus SikaLatex from Sika — so whichever brand your consultant has named, the bonding agent and the backup mortars come from one counter.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.