UltraTech Readiplast RP
One factory-blended bag, one smooth 15 mm coat, no site-mixing guesswork.
What is it?
A factory-blended, polymer-modified, cement-based ready-mix plaster that needs only water on site.
Where is it used?
Internal and external walls, RCC columns, beams, ceilings and soffits on residential, commercial and institutional projects.
Why use it?
Consistent factory quality, single-coat application up to 15 mm, and lower rebound loss than conventional plaster.
How is it applied?
Mixed with 16-19% water by weight, applied by trowel or spray in one layer up to 15 mm, then water-cured for 2-3 days.
About UltraTech Readiplast RP
UltraTech Readiplast RP is UltraTech’s factory-made answer to the age-old problem of inconsistent site-mixed plaster. Instead of a mason eyeballing cement, sand and water ratios on site, Readiplast RP arrives pre-blended in 40 kg bags – a polymer-modified cement mortar with graded sand and performance additives already proportioned at the factory. On site, the only variable left is water: 16-19% by weight, roughly 6-7 litres per bag, mixed to a workable, non-sagging consistency. The formulation is meant for masonry walls, RCC columns, beams, ceilings and soffits, and it is referenced against the standards used for plaster application and rendering in India – IS 1661, IS 2250 and IS 2402.
For contractors and consultants working Delhi NCR sites, the appeal is less about exotic chemistry and more about predictability. A factory-controlled mix means every bag performs the same way, coat after coat, floor after floor – no reworking a batch because a mason added an extra shovel of sand. Readiplast RP can be applied up to 15 mm in a single coat, cutting the number of passes needed compared with conventional two- or three-coat plastering, and its lower rebound loss means less material bouncing off the wall and into the debris pile. It still needs the basics done right – a clean, pre-wetted substrate and proper curing for 2-3 days – but for teams that want plaster quality to stop depending on which mason showed up that day, it removes most of the guesswork.
The technical insight
The performance gain comes from two things working together: gradation and polymer modification. UltraTech grades the sand at the factory to a tighter particle-size band than most site-procured sand, which reduces voids in the mortar matrix and gives a denser, more uniform plaster once it sets. Layered onto that is the polymer modification – redispersible polymer additives dosed into the dry mix that improve the mortar’s water retention during curing, so cement hydration isn’t starved by fast water loss into a thirsty brick or block substrate, and that improve flexibility and bond at the plaster-substrate interface. That combination is what lets the product hold thickness up to 15 mm in one pass without excessive shrinkage cracking, and why it tolerates slightly imperfect site curing better than a raw cement-sand mix would – though proper curing is still needed for the plaster to reach its full strength.
Where it is used
- Internal wall plastering in residential apartments and villas
- External rendering and facade plastering on masonry
- RCC column, beam and ceiling/soffit plastering
- Plastering over brick, AAC block, concrete block and stone masonry
- Renovation and re-plastering of old or damaged walls
- Base-coat preparation before painting, tiling or texture finishes
- Institutional and commercial building envelopes – offices, schools, warehouses
- Large multi-floor projects needing consistent plaster quality across units
Key advantages
- Factory-controlled mix eliminates on-site batching errors and mason-to-mason variation
- Single-coat application up to 15 mm reduces the number of plastering passes
- Lower rebound loss than conventional plaster cuts material wastage
- Graded sand and polymer additives give a denser, more crack-resistant finish
- Needs only water on site – no separate sand, cement or additive procurement
- Reduced water absorption improves long-term durability against dampness
- Smooth, consistent surface reduces putty or finishing-coat consumption before painting
- Faster plastering cycle helps compress schedules on multi-floor jobs
Limitations & considerations
- Maximum 15 mm per coat – thicker sections still need multiple layers with gaps between them
- Substrate must be clean, sound and pre-wetted; skipping prep undermines bond, same as any plaster
- Pot life is roughly an hour at normal site temperature, so batch sizes need planning to avoid waste
- Costs more per bag than loose site-mixed cement-sand plaster, so the value case rests on labour and wastage savings
- Still needs proper water curing for 2-3 days to reach full strength – the polymer helps but doesn’t remove that requirement
- Not a structural repair product – spalled concrete or rebar-level repairs need a dedicated repair mortar, not plaster
Selection & best practice
Start with a sound substrate: rake out weak joints, remove dust, oil, loose material and laitance, then pre-wet the wall until it is uniformly damp but not glistening with standing water – an overly dry substrate pulls moisture out of the plaster faster than the polymer can fully compensate for. Mix only what can be used within the pot life, roughly an hour at 27 degrees C, using clean water at 16-19% by weight (about 6-7 litres per 40 kg bag) in a mechanical mixer or heavy-duty drill paddle until the mortar is lump-free and workable. Apply in a single coat up to 15 mm using a trowel or a plaster pump/spray machine, working in manageable sections rather than trying to cover an entire elevation before the mortar starts to stiffen. Where a wall section genuinely needs more than 15 mm – badly out-of-plumb masonry, for instance – build up in layers, letting each layer take up before the next, rather than forcing one oversized pass. Once applied, water-cure the plaster for 2-3 days, watering it two to three times a day rather than one heavy soak, and protect fresh plaster from direct sun and strong wind in the first 24 hours so it doesn’t dry out and crack before it has gained strength.
Specifications
| Product type | Factory-blended, polymer-modified, cement-based ready-mix plastering mortar |
| Form / colour | Powder, natural grey |
| Pack size | 40 kg bag |
| Water requirement | 16-19% by weight of dry powder (approx. 6-7 litres per 40 kg bag) |
| Maximum coat thickness | Up to 15 mm in a single layer |
| Coverage | Approx. 18-20 sq.ft per 40 kg bag at 12 mm thickness (substrate-dependent) |
| Pot life | Approx. 1 hour at 27 degrees C |
| Compressive strength (28 days) | Approx. 8-9 MPa |
| Curing | 2-3 days, water-cured 2-3 times a day |
| Shelf life | 12 months from date of manufacture, stored dry |
| Reference standards | IS 1661, IS 2250, IS 2402 |
Industry use cases
Residential construction
Interior and exterior wall plastering on apartment and villa projects where floor-to-floor consistency and finish quality matter to buyers.
Commercial and office fit-outs
Fast, factory-quality plastering on office and retail shells ahead of tiling, painting or cladding.
Institutional buildings
Schools, hospitals and public buildings needing durable, low-maintenance wall finishes on tight schedules.
Renovation and retrofit
Re-plastering damaged or ageing walls in older structures without importing site-mixing variability into the repair.
Industrial sheds and warehouses
Plastering large masonry envelopes where speed of application and reduced wastage directly affect project cost.
Facade and rendering contractors
External rendering work where a dense, low-absorption finish helps resist dampness and staining over time.
Frequently asked questions
What is the difference between UltraTech Readiplast RP and ordinary site-mixed plaster?
How much water does a 40 kg bag of Readiplast RP need?
Can Readiplast RP be applied in a single coat?
What coverage should I plan for per bag?
Does Readiplast RP need curing like normal plaster?
Is Readiplast RP suitable for both interior and exterior walls?
How we position UltraTech Readiplast RP
Within the UltraTech range, Readiplast RP is the workhorse ready-mix plaster; for projects wanting to compare finish specifications, UltraTech’s Readiplast Projekt line is the variant to weigh against it, though Projekt is rated for a shallower 12 mm single-coat depth. For structural or spalled-concrete repair work that plaster was never designed for, Space Arc’s Fosroc Renderoc repair-mortar range (Renderoc HB+, Renderoc FC, Renderoc S) is the correct category, not a wall plaster. And where the same job also needs damp-proofing before or after plastering, pairing Readiplast RP with a Fosroc Nitoproof or Brushbond waterproofing coat addresses the two problems – surface finish and water ingress – separately rather than expecting one product to do both.
Fosroc Fosroc Renderoc Ready Plaster — Fosroc’s factory-blended, polymer-modified ready-mix plaster occupies the same slot as Readiplast RP – a bag-and-water system for internal/external wall and soffit plastering. The choice between them comes down largely to brand preference and site-specific TDS limits (coverage, maximum thickness) rather than any fundamental difference in approach, since both are single-component, polymer-modified cement plaster mortars.
Related Concrete Repair products
Source UltraTech Readiplast RP for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.