MC-Bauchemie MC-Protect KH 2
A two-component, polymer-rich flexible cementitious slurry that seals basements, water tanks and terraces against water from either side of the structure.
What is it?
A two-component (powder plus polymer liquid) flexible cementitious waterproofing slurry from MC-Bauchemie, brush, roller or spray applied over concrete and masonry.
Where is it used?
Basement tanking, overhead and underground water tanks, swimming pools, balconies, terraces, wet rooms and below-grade retaining walls.
Why use it?
It bridges fine shrinkage cracks, resists both positive and negative water pressure, and stays vapour-permeable so the substrate can still breathe.
How is it applied?
Blend Component A powder into Component B liquid to a lump-free slurry, then apply in two to three coats to a total dry thickness of 1.0 to 2.5 mm, allowing each coat to set before the next.
About MC-Bauchemie MC-Protect KH 2
MC-Protect KH 2 is MC-Bauchemie’s two-component flexible sealing slurry, built for the kind of waterproofing that has to hold up on real Indian sites: basement rafts that see a rising water table, terrace slabs that bake and then flood in the monsoon, and water-retaining structures where the coating is expected to last decades. It arrives as a pre-batched powder (Component A) and a polymer liquid (Component B). Site staff simply combine the two into a smooth, brushable slurry, so there is no guesswork with loose polymer or water dosing on site, and the mixed film cures into a continuous membrane that moves with the structure instead of cracking off it.
What sets a flexible slurry like this apart from a rigid cementitious coat is the elevated polymer content. That polymer gives the cured film enough elasticity to span the hairline cracks that almost every concrete element develops as it shrinks and settles, which is precisely where rigid coatings tend to fail. Because it is cement-based rather than a sheet membrane, it bonds monolithically to the substrate, follows every corner and upstand, and can be taken over complex detailing without laps or torching. For engineers and applicators across Delhi NCR and pan-India, that combination of flexibility, adhesion and simple two-part mixing makes it a dependable choice for tanking and water-retaining work.
The technical insight
The performance comes from the polymer-to-cement chemistry. Component A supplies cement, graded fillers and reactive additives; Component B is a polymer dispersion that replaces most of the mixing water. As the cement hydrates, the polymer particles coalesce into a continuous film that laces through and around the hardening cement matrix. That polymer network is what delivers the elasticity to bridge cracks in the 0.3 to 0.5 mm range and the tenacious adhesion that lets the coating resist negative-side water pressure, where water tries to push the film off the substrate from behind. At the same time the film stays microporous enough to remain vapour-permeable, so trapped moisture in the slab can escape as vapour rather than blistering the coating. In short, it is watertight to liquid water under head yet open to water vapour, which is the balance a durable below-grade or water-retaining coating needs.
Where it is used
- Basement wall and raft tanking against a high water table
- Overhead and underground water tanks, including potable water storage once fully cured
- Swimming pools, sumps and decorative water features
- Balcony, terrace and chajja waterproofing before tiling or screed
- Wet rooms, bathrooms and kitchens under tile beds
- Below-grade retaining walls and lift pits
- Sewage and effluent tanks needing a flexible protective lining
- Repair and re-lining of existing leaking concrete water structures
Key advantages
- Bridges fine shrinkage and settlement cracks thanks to its high polymer content
- Works on both the positive (water) side and the negative side of the structure
- Vapour-permeable, so the substrate can release trapped moisture instead of blistering
- Pre-batched two-part kit removes on-site polymer and water dosing errors
- Bonds monolithically to concrete and masonry with no laps, joints or torching
- Brush, roller or spray applicable, so it follows complex detailing and upstands
- Suitable for potable water tanks once fully cured
- Backed by MC-Bauchemie technical support through Space Arc as authorised distributor
Limitations & considerations
- Not a structural crack repair; live or moving cracks wider than its bridging range must be treated first
- Being cement-based, it needs a sound, clean, saturated-surface-dry substrate and proper curing to develop full properties
- Not designed for permanently UV-exposed or trafficked wearing surfaces without a suitable topcoat or screed
- Application and cure are temperature sensitive; very hot or very cold conditions affect coat timing and film formation
- Potable-water contact requires full cure and thorough flushing before the tank is put into service
Selection & best practice
Preparation decides the result. Start with a structurally sound substrate: remove laitance, curing compounds, oil and loose material, then repair honeycombing and form coves at wall-floor junctions. Pre-wet the surface to a saturated-surface-dry condition with no standing water so the slurry cures rather than being robbed of moisture. Mix Component A into Component B mechanically to a lump-free consistency and use it within its pot life. Apply in two to three coats, working the first coat firmly into the substrate; let each coat set before the next and lay successive coats at right angles for full, pinhole-free cover. Aim for a total dry film thickness of roughly 1.0 to 2.5 mm and reinforce moving joints and cracks with a suitable tape or fabric. Protect fresh coats from direct sun, rain and traffic, cure as specified, and always confirm mix ratios, coverage and cure times against the current MC-Bauchemie technical data sheet for the batch supplied.
Specifications
| Product type | Two-component polymer-modified flexible cementitious waterproofing slurry |
| Components | Component A powder plus Component B polymer liquid |
| Application method | Brush, roller or spray |
| Number of coats | 2 to 3 coats |
| Total dry film thickness | Approximately 1.0 to 2.5 mm |
| Crack-bridging capability | Fine cracks in the 0.3 to 0.5 mm range at ambient temperature |
| Application side | Positive (water) side and negative side |
| Permeability | Vapour-permeable (breathable) film |
| Potable water | Suitable for potable water tanks once fully cured |
Industry use cases
Residential and commercial basements
Tanking rafts and retaining walls against a rising water table, sealing from either side where external access is limited.
Water storage and treatment
Lining overhead, underground and treatment tanks, including potable water storage after full cure and flushing.
Terraces and balconies
A flexible waterproof layer under screed or tiles that absorbs slab movement and thermal cycling before finishing.
Swimming pools and water features
A crack-bridging membrane that holds head pressure and detailing around inlets, steps and coves.
Repair and rehabilitation
Re-lining existing leaking concrete tanks and wet areas with a bonded, breathable flexible coat.
Frequently asked questions
Can MC-Protect KH 2 be used on the negative (inside) face of a basement?
Is it safe for drinking water tanks?
Will it stop cracks in my slab from leaking?
How many coats do I need and how thick should it be?
Do I need to prime or wet the surface first?
Can I tile directly over it?
How we position MC-Bauchemie MC-Protect KH 2
MC-Protect KH 2 sits in the flexible two-component tier of MC-Bauchemie’s waterproofing range, a step above rigid single-component slurries where crack-bridging and negative-side performance matter. Where a project calls for an active, penetrating leak-sealing or an integral admixture approach rather than a surface slurry, the wider MC-Bauchemie waterproofing family covers those needs and pairs well with this coating on the same structure. Because Space Arc Engineering carries multiple brands, specifiers who prefer a locally ubiquitous system with easy pan-India availability often cross-shop the Fosroc equivalent for the same tanking and water-tank duties.
Fosroc Brushbond RFX — Choose Brushbond RFX when the specification names Fosroc or when a widely stocked, pan-India two-component acrylic cementitious membrane is preferred for the same tanking, tank and wet-area work.
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