UltraTech Seal & Dry 5 Plus
One acrylic-polymer liquid that bonds old concrete to new, waterproofs wet areas, fills hairline cracks and shields exposed rebar — a four-in-one for sites that can’t stock five separate drums.
What is it?
A water-based acrylic-polymer liquid gauged with cement on site to give a bonding slurry, a waterproofing coat, a crack-filling paste or a rebar primer, depending on the mix ratio used.
Where is it used?
Bathrooms, kitchens, sunken slabs, terraces and water tanks in residential and commercial buildings; also plaster/tile bonding, hairline crack repair and rebar protection before re-plastering in older RCC structures.
Why use it?
One drum replaces a separate bonding agent, waterproofing coat, crack filler and anti-corrosive primer — useful on small retrofit jobs where site storage is tight.
How is it applied?
Mixed with grey or white cement in a ratio suited to each use — roughly 1 part liquid to 3 parts water to 8 parts cement for the waterproofing coat — and applied by brush or trowel.
About UltraTech Seal & Dry 5 Plus
UltraTech Seal & Dry 5 Plus is an acrylic-polymer liquid from UltraTech’s Building Products range, positioned as the multi-role option alongside the SBR-latex Seal & Dry SBR and the elastomeric Seal & Dry Hi-Flex. It isn’t a ready membrane; it’s a concentrate gauged with cement — grey for waterproofing and priming, white for crack and joint filling — at different ratios per job.
That’s the point of the 5 Plus name: one drum covers bonding new plaster or screed to an old substrate, a waterproofing coat under tiling in bathrooms and sunken slabs, filling hairline shrinkage cracks, sealing tile and expansion joints, and priming exposed reinforcement before it’s re-covered. For a small contractor or housing-society job, that’s one product on site instead of four.
It is not a substitute for a dedicated elastomeric membrane on a roof with real thermal movement — Hi-Flex or a purpose-built membrane is the safer call there. 5 Plus earns its place in smaller, lower-movement wet areas and repair work.
The technical insight
The figure worth remembering is the 1 : 3 : 8 ratio — liquid : water : cement by weight — for the standard waterproofing coat, rated by manufacturer literature at roughly 100 sq.ft. per kg of liquid at 1 mm dry film thickness in a single coat. That assumes a smooth, saturated-surface-dry substrate; porous or rough concrete drinks more slurry and cuts coverage, so a trial patch before ordering full quantities is worth the hour it costs.
Solids content runs around 50% by weight at a near-neutral pH of 7-8, so it handles like a standard PVA-type bonding liquid, not an aggressive chemical. For crack and tile-joint work the liquid is gauged into a paste with white cement instead — manufacturer figures run to roughly 85 running metres per kg for a 6 mm x 6 mm V-groove crack and around 250 running metres per kg for a 2 mm x 6 mm tile joint, though actual consumption depends on how cleanly the groove is cut.
Where it is used
- Waterproofing coat under tiling in bathrooms, kitchens, sunken slabs and terraces
- Bonding coat between old concrete/plaster and new plaster, screed or repair mortar
- Crack filling in plastered walls and ceilings, V-groove method with white cement
- Tile and expansion joint filling
- Anti-corrosive priming coat on exposed, cleaned reinforcement before re-covering
- Key/priming coat on putty or plaster before painting, to mask shrinkage cracks
- Repair and retrofit waterproofing in residential and small commercial buildings
Key advantages
- Genuinely multi-purpose — one drum covers bonding, waterproofing, crack filling and rebar priming
- Water-based, non-toxic and non-flammable — easier to store and handle on occupied residential sites
- Near-neutral pH, so it doesn’t attack skin, tools or adjoining finishes like solvent-based systems can
- 18-month shelf life gives contractors room to buy ahead of a job
- Packed from 1 kg up to 20 kg, so it scales from one bathroom to a full building
Limitations & considerations
- Not a crack-bridging elastomeric membrane — unsuitable for roofs or joints with real thermal movement; use Hi-Flex or a dedicated membrane there instead
- Performance depends on correct gauging with cement; getting the ratio wrong undermines strength and waterproofing alike
- Coverage figures are manufacturer-indicative and vary with substrate porosity and application skill — run a trial patch
- Needs proper substrate prep — laitance removal, saturated-surface-dry condition — it won’t rescue a badly prepared surface
Selection & best practice
Prep the substrate first: strip loose laitance, dust and old paint, and pre-wet to saturated-surface-dry before applying. For the waterproofing coat, mix strictly by weight at 1 : 3 : 8, apply in one continuous coat at roughly 1 mm thickness, and let it cure fully before flood-testing and tiling over it. For crack and joint work, cut a clean V-groove, flush out dust, and pack the paste firmly rather than skim it on. Use the mixed slurry within its pot life — don’t retemper a stiffening batch with more water.
Specifications
| Chemistry | Single-component, water-based acrylic-polymer liquid |
| Solids content | ~50% ± 1% by weight |
| pH | 7 – 8 |
| Waterproofing coat mix ratio | 1 : 3 : 8 (Seal & Dry 5 Plus : water : cement, by weight) |
| Coverage — waterproofing coat | ~100 sq.ft./kg at 1 mm dry film thickness, single coat |
| Coverage — crack filling | ~85 running metres/kg for a 6 mm x 6 mm V-groove (with white cement) |
| Coverage — tile/expansion joint filling | ~250 running metres/kg for a 2 mm x 6 mm joint (with white cement) |
| Pack sizes | 1 kg, 5 kg, 10 kg, 20 kg |
| Shelf life | 18 months from date of manufacture, in sealed container |
| Safety | Non-toxic, non-flammable; use gloves/eye protection during handling |
Industry use cases
Residential retrofits
Waterproofing a bathroom or balcony during renovation without breaking up the whole floor before re-tiling.
Group housing / RWA maintenance
Society-scale terrace and sunken-slab waterproofing a local contractor can apply without membrane-laying equipment.
RCC repair and rebar protection
Priming cleaned, rust-treated reinforcement before re-plastering spalled balconies or columns in older buildings.
Tile and stone contractors
Bonding coat under tiling and expansion-joint filling on the same job, without switching products.
Frequently asked questions
How is Seal & Dry 5 Plus different from Seal & Dry SBR?
How many coats does a bathroom or terrace need?
Can it be used as an integral waterproofing admixture in concrete?
What’s the shelf life and how should it be stored?
Does the surface need special preparation before applying it?
How we position UltraTech Seal & Dry 5 Plus
Within Space Arc’s UltraTech range, 5 Plus sits below Hi-Flex (the crack-bridging membrane for roofs and high-movement joints) and alongside Seal & Dry SBR, which leans toward pure bonding. Treat 5 Plus as the general-purpose choice for bathroom/terrace waterproofing, bonding and crack repair on ordinary jobs, and step up to Hi-Flex where movement or ponding water is a real risk. On a Fosroc-standardised site, Nitobond SBR covers similar bonding-and-render ground, though it’s SBR latex rather than acrylic and isn’t marketed around the same rebar-coating and tile-joint use.
Fosroc Nitobond SBR — A specifier standardised on Fosroc might choose Nitobond SBR for the bonding-and-waterproof-render role, though it’s an SBR-latex chemistry rather than acrylic and isn’t marketed around the same rebar-coating and tile-joint uses UltraTech positions 5 Plus for.
Related Concrete Repair products
Source UltraTech Seal & Dry 5 Plus for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.