Fosroc Renderoc Superpatch
A single-component, polymer-modified patch mortar that sets in hours — for floor defects, spalled columns and edge repairs you need back in service the same shift.
What is it?
A rapid-setting, single-component polymer-modified cementitious patch and reprofiling mortar. You add only clean water on site, trowel it in, and it hardens fast enough to reopen the area within a few hours.
Where is it used?
Floor patching ahead of tile or epoxy flooring, spalled columns and beams, bridge piers, kerbs and slab edges — any localised concrete defect on buildings and infrastructure.
Why use it?
It removes the biggest cost of a repair: downtime. High early strength (over 20 MPa in about 2 hours) lets floors, walkways and structural surfaces return to service the same day rather than after a week of curing.
How is it applied?
Prepare and saturate the substrate, mix the powder with water to a trowellable consistency, and hand-apply in a single 5-40 mm pass. Firm the surface as it stiffens, then cure and overcoat as needed.
About Fosroc Renderoc Superpatch
Renderoc Superpatch is Fosroc’s answer to the repair that cannot wait. On a live floor, a busy corridor or an operating bridge deck, the real problem with patching concrete is rarely the mortar strength — it is the days of curing before anyone can walk, drive or build on the surface again. This product is engineered around that constraint. It is a single-component, polymer-modified cementitious mortar: the polymer improves adhesion to the parent concrete and controls drying shrinkage, while a rapid-setting binder drives early strength gain so the repair is load-bearing in hours, not days. Because it is pre-blended, the only site variable is water — which keeps quality consistent across crews and reduces the room for on-site error.
For engineers and contractors in India, that translates into practical, schedule-friendly repairs. A warehouse floor gouged by forklift traffic can be patched and flat before the next shift; a spalled column edge can be reprofiled and coated within the same working day; a kerb knocked out on a service road can be back under traffic before evening. Applied in a single pass from 5 mm up to 40 mm, Superpatch handles the medium-depth defects that fall between thin fairing coats and full formed reinstatement. It is part of the wider Fosroc Renderoc concrete-repair system, so it sits cleanly under Fosroc protective and anti-carbonation coatings when a durable, finished surface is the end goal.
The technical insight
The speed comes from two mechanisms working together. First, the binder system is formulated for rapid hydration, so a large share of the ultimate strength develops in the opening hours rather than over the conventional 7-28 day curve — this is what gives the typical figure of over 20 MPa compressive strength at around 2 hours and over 50 MPa at 28 days. Second, the polymer modification does two jobs at once: it wets and grips the prepared substrate for a strong bond line, and it reduces the free water available for shrinkage, so a fast-setting mortar can still cure without the cracking and debonding that plague quick repairs. The trade-off engineers must respect is the short working window — a pot life of roughly 10-15 minutes at 25 degrees C. The mix goes off quickly by design, which is exactly why it must be batched in small quantities and placed without delay.
Where it is used
- Patching floor defects, pop-outs and gouges before laying tiles, epoxy or PU flooring
- Reprofiling spalled or damaged columns and beams in buildings
- Surface repair of bridge piers, abutments and other infrastructure elements
- Reinstating damaged concrete kerbs, channels and slab edges on roads and paving
- Localised repair of honeycombed or delaminated structural concrete
- Fast turnaround repairs in warehouses, factories and logistics floors where downtime is costly
- Overhead and vertical patching on soffits and walls within the stated thickness range
- Preparatory repairs ahead of applying Fosroc Renderoc protective and anti-carbonation coatings
Key advantages
- Reopens to foot or wheeled traffic in hours, cutting the downtime that dominates repair cost
- High early strength — typically over 20 MPa at around 2 hours
- Single-component: only clean water is added on site, so quality stays consistent between crews
- Polymer modification gives strong adhesion to the parent concrete without a separate bonding agent on most work
- Controlled shrinkage reduces the cracking and debonding common to fast-set mortars
- Handles a useful 5-40 mm depth range in a single pass, covering most medium repairs
- Trowel-applied to floors, walls and soffits with no special plant
- Compatible with the wider Fosroc Renderoc repair and coating system for a finished, durable result
Limitations & considerations
- Very short pot life of roughly 10-15 minutes at 25 degrees C — mix small batches and place immediately
- The working window shortens further in hot Indian summer conditions, so timing and batch size need tighter control
- Single-pass thickness is capped at 40 mm; deeper or full-depth reinstatement needs a formwork-and-pour repair mortar or micro-concrete
- Rapid-set chemistry demands well-prepared, sound, saturated-surface-dry substrates — poor prep undermines the fast bond
- Not a structural crack-injection or leak-sealing product; active water leaks call for a plugging mortar instead
- Convenience and speed carry a higher material cost per kg than conventional slow-setting repair mortars
Selection & best practice
Success with a rapid-set mortar is decided before the powder ever touches water. Break out all loose, cracked or contaminated concrete back to a sound substrate, and cut clean square edges rather than feathering to nothing. Expose and clean any corroded reinforcement and treat it with a suitable primer before patching. Pre-soak the repair area to a saturated-surface-dry condition — damp but with no standing water — so the mortar is not robbed of its hydration water. Then batch small: mix only what a crew can place within the 10-15 minute pot life, and never re-temper mortar that has begun to stiffen. Apply firmly in a single 5-40 mm pass, working the mortar into the substrate, and finish before initial set. For larger or deep repairs, a Fosroc bonding primer (Nitobond SBR or Nitobond EP) improves the bond line. Cure the fresh repair against rapid drying, especially in hot or windy weather, and allow the appropriate interval before overcoating with a Renderoc protective coating.
Specifications
| Product type | Rapid-set, single-component polymer-modified cementitious patch repair mortar |
| Application thickness | 5-40 mm in a single coat |
| Compressive strength (approx. 2 hours) | Greater than 20 MPa (typical) |
| Compressive strength (28 days) | Greater than 50 MPa |
| Pot life at 25 degrees C | Approximately 10-15 minutes |
| Mixing | Add clean drinking-quality water only (single component) |
| Application method | Hand / trowel applied to floors, walls and soffits |
| Optional bonding primer | Nitobond SBR or Nitobond EP for larger or deep repairs |
Industry use cases
Warehousing & logistics
Patch forklift gouges and joint spalls in busy floors between shifts, so racking aisles are back under wheeled traffic the same day.
Commercial & industrial buildings
Reprofile spalled column and beam edges and repair floor defects ahead of epoxy or tile finishing, without holding up the following trade.
Bridges & highway infrastructure
Fast surface repairs to piers, abutments and kerbs where lane or deck closures must be kept as short as possible.
Roads & urban paving
Reinstate knocked-out kerbs, channels and slab edges and reopen the carriageway before the day’s traffic peak.
Repair & rehabilitation contracts
A go-to for localised medium-depth patches within a larger Renderoc repair scope, feeding straight into Fosroc protective coatings.
Frequently asked questions
How quickly can we reopen the repaired area to traffic?
What thickness can I apply in one go?
Do I need a bonding primer?
Why is the pot life so short, and how do we manage it?
Can it be used overhead and on vertical surfaces?
Is this the right product for sealing active water leaks?
How we position Fosroc Renderoc Superpatch
Renderoc Superpatch sits in the fast-turnaround slot of the Fosroc Renderoc concrete-repair family, chosen when downtime is the deciding factor. Within the same Fosroc range, pair it with a Nitobond SBR or Nitobond EP bonding primer for larger or deep repairs, treat exposed reinforcement with a Nitoprime Zincrich primer, and overcoat finished repairs with a Fosroc Renderoc or Dekguard protective/anti-carbonation coating for long-term durability. Where the defect is deep or full-depth, step up to a formed pour repair mortar or a Renderoc micro-concrete rather than building thick lifts. If the real problem is an active water leak rather than a surface defect, reach for Fosroc Renderoc Plug first to arrest the flow, then patch. For clients standardised on other brands we supply through, comparable rapid concrete-repair mortars are available from Dr. Fixit, Sika and MC-Bauchemie — our team can match the right system to your specification and site conditions.
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