STP ShaliCem EWP 200
A two-component cementitious coating engineered to stay rollable and watertight through Delhi NCR’s 45°C summers and monsoon ponding alike.
What is it?
STP ShaliCem EWP 200 is a two-component, UV resistant, flexible cementitious waterproof coating made of a graded-aggregate powder (Component A) mixed with a special acrylic polymer liquid (Component B), giving a rollable film with 190±20% elongation after 28 days.
Where is it used?
Washrooms, kitchens and balconies before tiling; exposed terraces and roofs; basements, machinery pits and retaining walls; and water-retaining structures such as sumps, cisterns and overhead tanks.
Why use it?
Its high elongation and 2 mm crack-bridging capacity (ASTM C836) let it move with hairline shrinkage and thermal cracking instead of splitting, its UV stability means it isn’t forced to be sealed away from sunlight immediately like many bitumen or basic acrylic systems, and it is food-grade, so the same coating that waterproofs a terrace can also line a drinking-water tank.
How is it applied?
Component A powder is stirred into Component B liquid for about 3 minutes to a lump-free slurry, the primed and dampened substrate is brushed with a ShaliCrete:cement (1:2) slurry, then two cross-wise brush coats of ShaliCem EWP 200 are applied, moist-cured for 3 days, and finally protected with a ShaliPlast IW-admixed PCC screed or, for trafficable roofs, a ShaliProtek PU HA topcoat.
About STP ShaliCem EWP 200
In Delhi NCR, a waterproofing coating has to survive two extremes in one year: peak summer UV with slab surface temperatures well past 55°C, then weeks of monsoon standing water and thermal shock as rain hits heat-soaked concrete. Single-component acrylic or bitumen coatings often go brittle and chalk under UV, or lose adhesion once water finds a hairline crack. STP built ShaliCem EWP 200 as a two-component cementitious system for exactly that cycle: the acrylic-polymer-modified cement film stays rollable rather than glass-hard, so it absorbs the shrinkage and thermal movement that terraces, tanks and wet-area screeds go through instead of cracking with them. Being cementitious rather than purely polymeric, it also bonds to damp concrete the way contractors are already used to working, with no need for bone-dry substrates or spray rigs.
On site it behaves like a trade most masons already understand: mix grey powder into milky liquid, prime with a cement slurry, brush on two cross-wise coats, keep it damp while it cures. That familiarity is a large part of why it shows up so often in NCR group-housing and builder-floor projects for washroom and terrace waterproofing ahead of tiling or screed work. As an authorised STP distributor and applicator, Space Arc Engineering supplies ShaliCem EWP 200 alongside the primer, crack-repair mortar and protective topcoat it’s designed to work with, and can put trained applicators on site so the two-coat, damp-cure discipline the data sheet calls for is actually followed — the step most on-site failures with this class of coating trace back to.
The technical insight
The number worth watching on STP’s data sheet is 190±20% elongation at 28 days (ASTM D412) — it’s what separates a flexible coating from a rigid one. A rigid cementitious slurry can match this product’s tensile strength on paper but cracks the moment the substrate moves a fraction of a millimetre; this film stretches with it instead. The 2.0 mm crack-bridging limit (ASTM C836) is the practical ceiling: hairline shrinkage and thermal cracks are well within range, but any wider or still-moving structural crack needs PlastiSeal P or a PMC mortar repair first — no flexible cementitious coating is a substitute for structural crack repair. Adhesion of >0.7 MPa to concrete (ASTM D4541) is what keeps the film from delaminating under the hydrostatic pressure typical of tanks and basements.
Where it is used
- Washroom and toilet wet-area waterproofing before tiling
- Kitchen wet zones and utility areas
- Balconies, sit-outs and planter boxes
- Exposed terraces and roofs (UV-facing)
- Basements, retaining walls and machinery pits
- Water tanks, sumps, cisterns and reservoirs (food-grade)
- Podium decks under landscaping or paving
- General cementitious surfaces needing crack-tolerant waterproofing
Key advantages
- 200% design elongation and a rollable film that bridges shrinkage and thermal cracking instead of splitting
- UV resistant, so it doesn’t need to be covered from sunlight the moment it cures
- Food-grade formulation, suitable for potable water tanks and cisterns
- Strong adhesion (>0.7 MPa) to cementitious substrates reduces delamination risk
- Two-coat brush application — no spray equipment or specialist rigs needed
- Fast recoat window (5–6 hours at 30°C) keeps site programmes moving
- Part of a compatible STP system (primer, repair mortar, protective topcoat) for single-source accountability
- Two-component ready formulation reduces the batching guesswork of liquid-only membranes
Limitations & considerations
- Pot life is only about 1 hour at 30°C — mixed material must be used fast, and NCR summer heat shortens this further
- Needs a genuine 3-day moist cure, which is hard to enforce without a supervised applicator on live sites
- Not a standalone wearing surface — trafficable roofs and decks still need a PCC screed or PU topcoat over it
- Hand-mixing a two-component system introduces batch-to-batch variability if site labour isn’t trained
- Coverage and cost rise on porous or uneven substrates, which draw extra material
- Crack-bridging tops out at 2 mm; wider or actively moving structural cracks need repair first, not just coating
Selection & best practice
Dampen the substrate thoroughly before priming — the data sheet calls for wetting dense concrete at least twice, 30 minutes apart, staying damp (not puddled) through application. Mix only what can be used inside the roughly one-hour pot life at 30°C; NCR summer site temperatures will shorten this further, so smaller batches beat one large mix. Apply the two coats genuinely cross-wise and keep a wet edge to avoid cold joints, then commit to the 3-day moist cure with light fogging, not a hose — under-cured film is the most common cause of premature cracking or peeling reported on site. Never leave it as a standalone wearing surface on trafficable roofs or decks; protect it with a ShaliPlast IW-admixed PCC screed or ShaliProtek PU HA topcoat as specified.
Specifications
| System | 2-component, UV resistant, flexible cementitious coating |
| Components | Component A: grey powder; Component B: milky white liquid |
| Mixing ratio (w/w) | 12.4 : 7.6 (20 kg pack) / 31 : 19 (50 kg pack) |
| Mixed density | ~1.80 g/cc |
| Pot life @ 30°C | 1 hour |
| Elongation @ 28 days (ASTM D 412) | 190 ± 20% |
| Tensile strength @ 28 days (ASTM D 412) | 1.2 ± 0.1 MPa |
| Adhesion to concrete (ASTM D 4541) | > 0.7 MPa |
| Crack bridging ability (ASTM C 836) | 2.0 mm max |
| Theoretical coverage | 1.6–1.9 kg/m² @ 1.0 mm; 2.4–2.8 kg/m² @ 1.5 mm |
| Pack sizes | 20 kg and 50 kg |
Industry use cases
Residential (group housing/builder floors)
Washroom and terrace waterproofing ahead of tiling or protective screed, where recoat speed and site-friendly brush application matter.
Institutional/commercial roofs
UV-facing exposed terrace waterproofing where a single-component acrylic would chalk or lose flexibility over a season.
Water infrastructure
Food-grade lining for overhead tanks, sumps and cisterns in housing societies and commercial buildings.
Basements and podiums
Retaining wall and machinery pit waterproofing under hydrostatic conditions, backed by its >0.7 MPa adhesion rating.
Landscaped decks
Waterproofing under planter boxes and podium landscaping before paving, where root and moisture exposure is constant.
Frequently asked questions
Can ShaliCem EWP 200 be left exposed on a terrace without any protective screed?
Is it actually safe for a drinking-water tank?
How many coats and what total thickness do I need?
Will it bridge cracks that already exist in my slab?
What’s the pot life, and can I remix leftover material later?
How does EWP 200 differ from ShaliCem EWP 150 or ShaliCem FWP?
How we position STP ShaliCem EWP 200
ShaliCem EWP 200 sits at the top of STP’s ShaliCem flexible-coating family: ShaliCem FWP and ShaliCem EWP cover lighter-duty needs, ShaliCem EWP 150 is a lower-elongation tier, and ShaliCem EWP AR is a specialised variant — Space Arc can help match the right tier to a project’s substrate and exposure. It’s designed as part of a system, not a standalone product: ShaliCrete for priming, PlastiSeal P or PMC mortar for crack repair ahead of coating, and ShaliPlast IW-admixed PCC or ShaliProtek PU HA to protect it once cured. For buyers comparing brands, Fosroc’s Nitoproof 600 is the nearest widely specified NCR alternative — a single-component, pitch-modified polyurethane membrane rather than a two-component cementitious coating, better suited to concealed, below-grade waterproofing than to UV-exposed terraces and wet areas. Pidilite’s Dr. Fixit range is the other brand contractors commonly ask to compare; get a like-for-like data sheet before assuming equivalence.
Fosroc Nitoproof 600 — A specifier might choose Nitoproof 600 for concealed, below-grade waterproofing (basements, foundations) where its single-component pitch-modified polyurethane membrane is easier to apply as a monolithic layer and UV resistance isn’t a factor, whereas ShaliCem EWP 200’s UV stability and rollable flexibility make it the better choice for exposed terraces, balconies and tiled wet areas.
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