UltraTech Seal & Dry
Single-component, polymer-modified cementitious coating mixed with water and brushed on for positive-side waterproofing.
UltraTech Seal & Dry at a glance
The essentials specifiers and contractors ask first — answered straight from the product data, with links to go deeper.
What is it?
UltraTech Seal & Dry is a single-component, cement-based, polymer-modified waterproof coating made with graded sand and fillers for positive-side waterproofing. Supplied as a powder, it is mixed only with clean water and brush-applied in two coats to form a tough, self-curing, well-bonded layer. It is the entry-level coating in UltraTech's Seal & Dry / Weather Pro range, below the two-component Flex and Hi-Flex elastomeric coatings.
Where is it used?
It is intended as a positive-side waterproofing underlayment for chajjas, bathrooms, sunken areas and small terraces, and works on brick, block and concrete surfaces of any geometry on both new and renovation work. It is CFTRI-approved for food-grade applications, so it also suits potable-water and food-contact areas. For high-movement decks, ponded roofs or crack-prone substrates, the two-component Flex or Hi-Flex grades are the better choice.
Why use it?
It is a simple, economical, single-component system: just add water, with no separate polymer liquid to measure, so there is little batching error and fast application. It self-cures (no separate water-curing regime), bonds strongly to masonry and concrete, and is food-grade approved, making it a practical positive-side coating for everyday wet-area and small-terrace waterproofing.
How is it applied?
Prepare and clean the substrate to a sound, surface-saturated-dry (SSD) condition, mix the powder with clean water to a brushable slurry, and apply two coats with a soft/stiff brush, the second perpendicular to the first, to build the recommended film. The official coverage is about 1-1.2 sq.m per kg at 1.2-1.5 mm dry film thickness over two coats; always follow the current UltraTech TDS for water ratio, recoat interval and curing.
Key advantages
- Single-component - mixed with clean water only, with no separate polymer liquid to measure, so minimal site batching error
- Strong adhesion to brick, block and concrete, forming a well-bonded positive-side waterproofing layer
- Self-curing - no separate water-curing regime required, which saves time on site
- CFTRI-approved for food-grade applications, suitable for potable-water and food-contact wet areas
- Eco-friendly, non-hazardous cementitious system that is easy and quick to apply by brush
- Negligible wastage and convenient application for fast coverage of chajjas, sunken areas and small terraces
- Works on substrates of any geometry, both new construction and renovation
- Available in 1 kg, 5 kg and 25 kg packs to suit small repairs through to larger areas
Specifications
- Product type: Single-component, cement-based, polymer-modified waterproof coating (with graded sand and fillers) for positive-side waterproofing
- Components: Single component - mixed with clean water only (no separate liquid polymer)
- Form: Powder (mixed with water to a brushable slurry)
- Coverage: 1 - 1.2 sq.m per kg at 1.2-1.5 mm dry film thickness (DFT) in 2 coats
- Dry film thickness: 1.2-1.5 mm total DFT over 2 coats
- Number of coats: 2 coats (second coat perpendicular to the first)
- Curing: Self-curing
- Food-grade approval: CFTRI approved for food-grade applications
- Pack sizes (SKUs): 1 kg, 5 kg and 25 kg
- Full technical data: Request the current UltraTech Technical Data Sheet for water ratio, recoat interval, pot life, shelf life and complete application details
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About UltraTech Seal & Dry
A plain-language overview of what UltraTech Seal & Dry is, the problem it solves and how Space Arc Engineering positions it in a specification.
UltraTech Seal & Dry is a single-component, cement-based, polymer-modified waterproof coating from UltraTech Building Products. It is supplied as a grey powder containing high-quality additives, graded sand and fillers, and is mixed on site only with clean water - there is no separate liquid polymer component to dose, which keeps mixing simple and consistent. Once mixed and brushed on in two coats it cures to a tough, well-adhered cementitious layer that resists water from the positive (water-facing) side.
Within UltraTech's waterproofing portfolio, Seal & Dry is the entry-level brush-applied coating. It sits below the two-component Weather Pro / Seal & Dry Flex (>50% elongation) and Hi-Flex (>100% elongation, elastomeric) grades, which are designed for substrates that move or crack. Seal & Dry itself is a rigid-to-semi-rigid cementitious coating: it is strong, well-bonded and self-curing, but it does not have the high crack-bridging elongation of the flexible grades, so product selection should be matched to how much movement the substrate will see.
A notable feature is that Seal & Dry is CFTRI-approved for food-grade applications, which makes it suitable for potable-water tanks and food-contact wet areas where many ordinary coatings are not. Space Arc Engineering, an Authorized Project Distributor of UltraTech Building Products, supplies Seal & Dry across India and can help specifiers and contractors choose between the base Seal & Dry and the flexible Flex/Hi-Flex grades for a given application. For complete figures - water ratio, pot life, recoat interval and curing - always request the current UltraTech Technical Data Sheet.
The technical insight
Why UltraTech Seal & Dry behaves the way it does — the mechanism behind the performance, in specifier-friendly terms.
Seal & Dry works on a cementitious, polymer-modified principle. The cement and graded sand provide a hard, mineral matrix that bonds tightly to the cementitious substrate as it hydrates, while the dispersed polymer additives reduce permeability, improve adhesion and toughness, and let the thin coat cure and perform without a separate water-curing regime (it is described by UltraTech as self-curing). Because it is a single-component powder, the polymer is pre-blended into the dry mix, so the only site variable is the water added - this is what makes batching forgiving compared with two-part liquid-plus-powder systems. The trade-off is flexibility: a polymer-modified cementitious coating like this resists water and bonds well, but it is not elastomeric, so it relies on a sound, stable substrate rather than on stretching across moving cracks. Where significant crack-bridging is needed, UltraTech's two-component Flex (>50% elongation) and Hi-Flex (>100% elongation, up to 5 bar water pressure resistance at 1 mm DFT) grades are formulated for that duty.
Where UltraTech Seal & Dry is used
Typical applications UltraTech Seal & Dry is specified for, supplied by Space Arc Engineering across Delhi NCR, Ghaziabad, Noida and Uttar Pradesh.
- Positive-side waterproofing underlayment for chajjas and projections
- Waterproofing of bathrooms, toilets and other internal wet areas before tiling
- Waterproofing of sunken slabs and sunken portions of bathrooms and balconies
- Waterproofing of small terraces and similar low-movement roof areas
- Coating of overhead and underground water tanks, including potable-water tanks (CFTRI food-grade approved)
- Waterproofing over brick, block and concrete surfaces of any geometry on new and renovation work
Key advantages
The properties that make UltraTech Seal & Dry the right choice — drawn from the manufacturer's product literature.
- Single-component - mixed with clean water only, with no separate polymer liquid to measure, so minimal site batching error
- Strong adhesion to brick, block and concrete, forming a well-bonded positive-side waterproofing layer
- Self-curing - no separate water-curing regime required, which saves time on site
- CFTRI-approved for food-grade applications, suitable for potable-water and food-contact wet areas
- Eco-friendly, non-hazardous cementitious system that is easy and quick to apply by brush
- Negligible wastage and convenient application for fast coverage of chajjas, sunken areas and small terraces
- Works on substrates of any geometry, both new construction and renovation
- Available in 1 kg, 5 kg and 25 kg packs to suit small repairs through to larger areas
Limitations & considerations
Where UltraTech Seal & Dry is not the right answer. Check these constraints from the manufacturer before specifying — using it outside its scope is the most common cause of failure.
- It is a polymer-modified cementitious coating, not an elastomeric membrane - it does not have the high crack-bridging elongation of the two-component Flex/Hi-Flex grades and is best on sound, low-movement substrates
- UltraTech positions it for chajjas, bathrooms, sunken areas and small terraces; for large exposed terraces, podiums, swimming pools or high-hydrostatic-head zones the flexible/elastomeric grades or a designed system are more appropriate
- As a positive-side coating it is applied to the water-facing surface; it is not intended as a negative-side or under-slab tanking solution
- It requires correct surface preparation (clean, sound, surface-saturated-dry substrate) and protection of the fresh coat; poor prep or rigid application over an actively cracking substrate will compromise performance
- For potable-water use the relevant food-grade/CFTRI conditions and curing must be observed - confirm the current TDS and any project approvals before specifying for drinking-water tanks
Selection & best practice
How to decide whether UltraTech Seal & Dry fits your job — and how to apply it so the repair lasts.
Specify UltraTech Seal & Dry when you need a simple, economical, single-component positive-side waterproofing coat for stable substrates such as chajjas, bathrooms, sunken areas, small terraces and water tanks, especially where a food-grade/CFTRI approval is wanted. If the substrate will move, crack or flex - large open terraces, sloping roofs, balconies, domes or pools - step up to the two-component Seal & Dry / Weather Pro Flex (>50% elongation) or Hi-Flex (>100% elongation, elastomeric) grades for crack-bridging. If you only need a bonding agent or modifier rather than a coating, the related Seal & Dry SBR (SBR latex) or Seal & Dry 5 PLUS (acrylic) products are the correct choice; Space Arc can help match the grade to the application.
Application best practice
- Prepare the substrate thoroughly: remove dust, laitance and loose material, repair honeycombing and form coves at wall-floor junctions, then bring the surface to a clean, sound, surface-saturated-dry (SSD) condition before coating
- Mix the powder into clean water (not water into powder) to a uniform, lump-free brushable slurry, using a slow-speed mechanical stirrer, and only mix the quantity that can be used within the working time
- Apply two coats with the second coat perpendicular to the first to ensure full, pinhole-free coverage and the recommended 1.2-1.5 mm dry film thickness over the two coats
- Reinforce vulnerable details - corners, junctions, pipe penetrations and cracks - and increase the number of coats in demanding areas as advised in the TDS
- Respect the manufacturer's recoat interval between coats and allow the coating to cure before flooding, tiling or screeding over it
- For potable-water tanks, fill, drain and flush as recommended before the tank is put into service, and confirm food-grade/CFTRI conditions for the project
Specifications
Indicative properties from the manufacturer's literature. Always confirm batch-specific values against the current TDS before specification.
| Product type | Single-component, cement-based, polymer-modified waterproof coating (with graded sand and fillers) for positive-side waterproofing |
|---|---|
| Components | Single component - mixed with clean water only (no separate liquid polymer) |
| Form | Powder (mixed with water to a brushable slurry) |
| Coverage | 1 - 1.2 sq.m per kg at 1.2-1.5 mm dry film thickness (DFT) in 2 coats |
| Dry film thickness | 1.2-1.5 mm total DFT over 2 coats |
| Number of coats | 2 coats (second coat perpendicular to the first) |
| Curing | Self-curing |
| Food-grade approval | CFTRI approved for food-grade applications |
| Pack sizes (SKUs) | 1 kg, 5 kg and 25 kg |
| Full technical data | Request the current UltraTech Technical Data Sheet for water ratio, recoat interval, pot life, shelf life and complete application details |
Coverage, dosage, pack sizes and cure times vary with substrate and conditions — request the full TDS for certified technical data.
Industry use cases
Real-world scenarios where UltraTech Seal & Dry is the practical choice — the teams who reach for it and the jobs it does for them.
- Residential construction - positive-side waterproofing of bathrooms, sunken areas and small terraces before tiling and finishing
- Water-tank waterproofing - lining of potable-water tanks and sumps where a food-grade (CFTRI-approved) coating is required
- Repair and renovation - re-coating leaking chajjas, wet areas and small terraces on existing buildings
- Commercial and institutional wet areas - quick, single-component waterproofing of toilet blocks and service areas
- Builder/contractor wet-area packages - economical base coat where the substrate is sound and high elongation is not required
Frequently asked questions
Common questions about specifying and sourcing UltraTech Seal & Dry.
What is UltraTech Seal & Dry?
It is a single-component, cement-based, polymer-modified waterproof coating made with high-quality additives, graded sand and fillers for positive-side waterproofing. Supplied as a powder, it is mixed only with clean water and brushed on in two coats to form a tough, self-curing, well-bonded layer. It is the entry-level coating in UltraTech's Seal & Dry / Weather Pro range.
Where can UltraTech Seal & Dry be used?
UltraTech recommends it as a positive-side waterproofing underlayment for chajjas, bathrooms, sunken areas and small terraces, on brick, block or concrete surfaces of any geometry, on new and renovation work. Because it is CFTRI-approved for food-grade applications, it is also suitable for potable-water tanks and food-contact wet areas.
Is Seal & Dry a single- or two-component product?
It is a single-component, polymer-modified cementitious powder. The polymer is pre-blended into the dry mix, so on site it is mixed only with clean water - there is no separate liquid polymer to measure. This is what makes the base Seal & Dry simpler to batch than the two-component Flex and Hi-Flex grades.
What coverage and film thickness should I expect?
Per UltraTech's official data, coverage is about 1 to 1.2 sq.m per kg at a dry film thickness of 1.2 to 1.5 mm built up over two coats. Apply the second coat perpendicular to the first for full coverage, and increase coats in demanding areas. Actual usage depends on substrate texture and detailing.
How is Seal & Dry different from Seal & Dry Flex and Hi-Flex?
The base Seal & Dry is a single-component, polymer-modified cementitious coating - strong and well-bonded but not elastomeric. The Flex (>50% elongation) and Hi-Flex (>100% elongation, up to about 5 bar water pressure at 1 mm DFT) grades are two-component, polymer-rich elastomeric coatings designed to bridge cracks on moving substrates. Use the base grade on sound substrates and step up to Flex/Hi-Flex where crack-bridging is needed.
Can UltraTech Seal & Dry be used in drinking-water tanks?
Yes - it is CFTRI-approved for food-grade applications, which is why it is commonly used for potable-water tanks and food-contact wet areas. For drinking-water use, follow the recommended curing and the fill-drain-flush procedure before the tank is put into service, and confirm any project-specific approvals against the current TDS.
Does it need water curing, and what pack sizes are available?
It is self-curing, so a separate water-curing regime is generally not required, though the fresh coat should be protected as advised. It is available in 1 kg, 5 kg and 25 kg packs, suiting small repairs through to larger areas. Contact Space Arc Engineering for current availability, pricing and the full Technical Data Sheet.
References
Manufacturer and technical sources this page draws on. Always confirm current data against the live TDS before specification.
- https://www.ultratechcement.com/for-homebuilders/products/overview-building-product/waterproofing-chemicals/flex-hiflex
- https://www.ultratechcement.com/for-homebuilders/products/overview-building-product
- https://5.imimg.com/data5/SELLER/Doc/2024/4/408269719/SR/KH/FQ/51225931/ultratech-seal-and-dry.pdf
Source UltraTech Seal & Dry for your project
Space Arc Engineering is an authorised distributor for UltraTech, serving Delhi NCR, Ghaziabad, Noida and Uttar Pradesh. Talk to us for pricing, the technical data sheet and on-site support.
Or email info@space-arc.com · www.space-arc.com