Fosroc Reebaklens
An inhibited acid-based cleaning and etching agent that lifts mortar stains, laitance, hardened concrete and rust, and opens up a concrete surface so protective coatings actually bond.
What is it?
A clear blue, acid-based liquid built from acid, corrosion inhibitors and dispersing agents. It works as a multipurpose cleaner and etchant for concrete, masonry, steel, tools and equipment.
Where is it used?
Concrete floors before resin or protective coatings, brick and concrete facades stained with mortar and plaster, steelwork carrying rust or mill scale, and tools, mixers and shuttering caked with hardened concrete.
Why use it?
It removes surface laitance and contamination and etches a fine mechanical profile, giving coatings and screeds the clean, keyed substrate they need to adhere instead of peeling.
How is it applied?
Diluted with water (typically between 1:1 and 1:4), brushed, sponged or mopped onto a pre-wetted surface, allowed to react, then rinsed off thoroughly with clean water.
About Fosroc Reebaklens
Reebaklens is Fosroc’s workhorse acid-based cleaning and etching agent, and on Indian sites it tends to earn its keep in two situations: cleaning up hardened mess, and preparing surfaces for whatever goes on top. Supplied as a clear blue solution, it combines an active acid with corrosion inhibitors and dispersing agents, so it bites into cementitious contamination and rust while being gentler on the base material than a raw acid would be. Contractors reach for it to strip mortar runs, plaster droppings and efflorescence off brick and concrete, to clean caked concrete off trowels, mixer drums and shuttering, and to take rust and mill scale off steel before painting.
Its second and arguably more important role is surface preparation. New or old concrete floors carry a weak, dusty layer of laitance that no coating can grip; Reebaklens dissolves that layer and etches the surface to a fine sandpaper-like profile, giving epoxy, PU and other protective systems a sound, open key to bond into. For a distributor and applicator audience, that makes it a prep-stage consumable rather than a headline product, but skip it and the expensive coating on top is the thing that fails. Space Arc Engineering supplies Reebaklens as an authorised Fosroc distributor across Delhi NCR and pan-India, alongside the coatings and repair systems it usually feeds into.
The technical insight
The chemistry is deliberately a compromise. A strong mineral acid on its own would clean and etch concrete quickly, but it would also flash-rust embedded steel, keep reacting after you want it to stop, and leave an aggressive residue. Reebaklens blends the acid with corrosion inhibitors that slow attack on ferrous metal and with dispersing agents that hold the dissolved salts and loosened debris in suspension so they rinse away cleanly instead of re-depositing as a haze. On concrete, the acid reacts with the calcium compounds in the laitance and cement paste, breaking down that weak top skin and micro-roughening the surface. The result is what coating specifiers call a good profile: the substrate goes from smooth and chalky to clean and slightly toothed, dramatically increasing the real contact area a coating can grab. The inhibitor package is also why it is described as safe on most metals, wood, glass, plastic and rubber, with zinc and galvanised steel the notable exceptions, since acid attacks zinc readily. The single most important step is the water rinse afterwards: any acid or reacted salt left on the surface will interfere with adhesion and can carbonate later, so thorough neutralising and rinsing is not optional, it is the job.
Where it is used
- Etching and cleaning concrete floors before epoxy, PU or protective coating application
- Removing mortar, plaster runs, droppings and stains from brickwork and concrete facades
- Stripping hardened concrete build-up off trowels, floats, mixer drums and shuttering
- Cleaning rust and mill scale from steelwork prior to priming and painting
- Removing efflorescence and cement haze from tiles, pavers and clay products
- Preparing existing floors for a new screed or overlay by opening the surface
- Descaling and cleaning small tools and implements by soaking or dipping
- General degreasing and cleaning where oil and grease sit over cementitious surfaces
Key advantages
- Acts as both a cleaner and an etchant, covering two prep steps with one product
- Corrosion inhibitors reduce aggressive attack on embedded and adjacent steel
- Dispersing agents keep loosened debris in suspension so it rinses away cleanly
- Etches concrete to a fine mechanical profile that markedly improves coating adhesion
- Flexible dilution from 1:1 to 1:4 lets you dial strength to the job
- Compatible with most substrates including wood, glass, plastic and rubber
- Penetrates oil and grease, so lightly soiled surfaces need less pre-cleaning
- Available in 1, 5 and 20 litre packs to suit small repairs through to floor jobs
Limitations & considerations
- It is acidic, so operators need gloves, goggles and ventilation, and splashes must be managed
- Attacks zinc, galvanised steel and aluminium, which must be masked or kept clear
- Demands a thorough water rinse afterwards; residual acid ruins coating adhesion
- Not a structural or repair product, it only cleans and profiles the surface
- Effluent is acidic and must be neutralised and disposed of responsibly, not flushed untreated
- Effectiveness depends on dilution, dwell time and rinsing, so results vary with workmanship
Selection & best practice
Start by testing on a small area to fix the right dilution and dwell time for the substrate. Pre-wet the surface with clean water so the acid does not soak in too deep or dry too fast, then apply Reebaklens diluted between 1:1 and 1:4 by brush, sponge or acid-resistant mop, working in manageable bays. Let it fizz and react, agitating stubborn deposits with a stiff brush, but do not let it dry on the surface. Rinse extremely thoroughly with clean water, ideally more than once, until the run-off is clear and the surface is neutral; a litmus check on floors before coating is good discipline. For tools and small items, soak or dip them and then wash off. Keep the material off zinc, galvanised and aluminium components, collect and neutralise the acidic run-off before disposal, and always let the etched concrete dry back to the coating manufacturer’s required moisture level before the primer goes down.
Specifications
| Product type | Acid-based cleaning and etching agent |
| Composition | Acid with corrosion inhibitors and dispersing agents |
| Appearance | Clear blue solution |
| Dilution range | 1:1 to 1:4 (product to water, by volume) |
| Substrate compatibility | Safe on most metals, wood, glass, plastic and rubber |
| Not suitable for | Zinc, galvanised steel and aluminium |
| Application method | Brush, sponge, mop or dip; rinse with clean water |
| Pack sizes | 1 litre, 5 litre and 20 litre containers |
Industry use cases
Industrial flooring
Etching and cleaning warehouse and plant floors so epoxy and PU floor systems bond to a sound, laitance-free, profiled substrate.
Facades and masonry
Removing mortar smears, plaster droppings and efflorescence from brick and concrete elevations during finishing and handover cleaning.
Steel fabrication and structures
Stripping rust and mill scale from steelwork before priming, giving anti-corrosive coatings a cleaner surface to key into.
Precast and site plant
Cleaning hardened concrete off mixer drums, trowels, shuttering and tools to keep equipment serviceable and free-running.
Repair and refurbishment
Opening up tired existing floors and slabs so a new screed, overlay or coating gets a proper mechanical grip.
Frequently asked questions
Is Reebaklens a mould release agent?
What dilution should I use?
Can I use it to etch a floor before epoxy?
Is it safe on all metals and surfaces?
How much does one litre cover?
What safety precautions matter most?
How we position Fosroc Reebaklens
Reebaklens is a surface-preparation and cleaning consumable, so it sells best paired with what comes before and after it. Within the Fosroc family, Reebol is its natural companion but a different job entirely: Reebol is the oil-based mould release agent for formwork, whereas Reebaklens cleans and etches the finished surface. When the etched floor is ready, it typically feeds into a Fosroc protective or flooring coating such as the Nitocote or Nitoflor ranges, which are exactly the systems that need this prep to perform. Across our other brands, engineers doing floor prep also look at Dr. Fixit and MC-Bauchemie surface cleaners and etchants, and at Sika’s floor coating systems where a project is specified around that brand. If the requirement is genuinely rust and mill-scale removal on structural steel, that usually sits alongside a dedicated protective coating rather than being solved by the etchant alone.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.