UltraTech Crack Filler
A ready-to-use paste from a squeeze tube that fills hairline wall cracks in minutes, with no mixing and no trowel work.
What is it?
A cement-based, polymer-enriched crack filling paste that comes pre-mixed in a squeeze tube, so there is no water, mixing bowl, or float involved.
Where is it used?
Interior plastered walls, ceilings, door and window frame junctions, false ceiling joints, and any cosmetic surface crack up to 4 mm wide.
Why use it?
It lets painters, site supervisors, and homeowners close up hairline cracks and nail holes in one sitting, without booking a mason for a small patch job.
How is it applied?
Clean the crack, squeeze the paste in from the tube, smooth it flush with the tube cap, let it dry, then paint over it.
About UltraTech Crack Filler
Every plastered wall in India develops hairline cracks sooner or later — shrinkage cracks as the plaster cures, fine movement lines around door and window frames, or the cosmetic cracks that show up during final snagging before handover. UltraTech Crack Filler was built specifically for that category of defect: not a structural repair, not a waterproofing treatment, just a fast, no-mess way to close a fine surface crack before the painter moves in. It ships ready to use in a squeeze tube, which is the whole point of the product — a site painter or a homeowner can pick it up, cut the nozzle, and fill a crack without measuring water, mixing putty, or keeping a trowel handy.
On a typical interior fit-out or repainting job, this is one of the last things to go on before the primer coat. Once plaster work, electrical chasing, and POP or gypsum ceiling joints are finished, the paste goes over hairline lines, nail holes, screw heads, and small gaps at frame junctions. It comes in White, Cream, Light Yellow, and Light Blue to sit close to common wall tones even without a top coat, plus a Transparent grade for surfaces where colour-matching isn’t practical — the transparent variant takes about two days to fully clarify after application. Because the paste is cement-based rather than acrylic, it keys into the crack instead of just skinning over it, which is why UltraTech positions it as peel-resistant rather than a temporary cosmetic patch.
The technical insight
The paste is a cement-based system carried in a polymer binder rather than the acrylic or silicone fillers most Indian sites default to. That distinction matters more than it sounds: an acrylic filler mostly skins over a gap and relies on surface tack to stay put, while a cement-based paste hydrates inside the crack and bonds to the surrounding plaster the way a mortar patch would, just at a much finer scale. The polymer fraction in the mix does three jobs at once — it keeps the paste flowable enough to extrude cleanly from a narrow nozzle, it improves wetting on porous plaster and gypsum so the paste doesn’t just sit on top of surface dust, and it adds enough flexibility that the cured fill resists cracking again from ordinary building movement. Because cure is driven by moisture and cement hydration rather than solvent evaporation, ambient humidity has an outsized effect on drying time — the same crack that touch-dries in half an hour on a dry, hot day can take the better part of a full day to firm up during the monsoon, which is worth planning around when you’re sequencing a painting schedule.
Where it is used
- Hairline shrinkage cracks in interior plaster
- Pre-paint touch-up before priming and repainting
- Nail holes, screw holes, and switchboard cut-outs
- Gaps at door and window frame junctions
- False ceiling and gypsum partition joint lines
- Cosmetic edge and joint touch-up on indoor tile, marble, and granite
- Snagging and handover defect rectification in new flats
- General interior wall and ceiling touch-up ahead of a repaint cycle
Key advantages
- Ready to use straight from the tube — no water, mixing, or trowel needed
- Cement-based formula bonds into the crack rather than just skinning over it
- Smooth, paintable, peel-resistant finish once cured
- Fast touch-dry time in normal conditions keeps painting schedules moving
- Five colour options reduce the need for a full top coat on matched walls
- 24-month shelf life makes it practical to keep on hand at a site store
- Low skill barrier — painters, finishers, and homeowners can apply it correctly
- Compact tube format is easy to carry around a site for small punch-list jobs
Limitations & considerations
- Interior use only — not rated for exterior, weather-exposed, or wet-area cracks
- Not a waterproofing product; it will not hold back water under pressure
- Not suitable for structural, load-bearing, or actively moving cracks
- Limited to narrow cracks up to 4 mm; wider or deeper defects need a trowel-applied repair mortar
- Drying time stretches significantly in humid weather, which can delay painting schedules
- Reliable results depend on using an opened tube within about six months
Selection & best practice
Rake out any loose plaster, flaking paint, or dust from the crack before you start — the paste needs a clean, dry substrate to key into, and applying it over debris just means the crack reopens later. Shake the tube, then cut the nozzle to roughly match the crack width so you’re not fighting the applicator on wider gaps. Squeeze firmly enough to push paste to the full depth of the crack rather than bridging across the top, then draw the tube’s cap along the line to press the fill flush and leave a smooth, paintable surface; wipe off any excess with a damp cloth before it sets. Wider or deeper cracks are better handled in two passes — let the first fill firm up before going back over it — rather than trying to overfill in one go. Keep application within the 5°C to 45°C range the manufacturer specifies, test on a small hidden patch first if you’re unsure how a colour will read against the wall, and build in a full 24-hour drying window before priming or painting, longer if the site is humid. Treat this strictly as a cosmetic and shrinkage-crack fix — a crack that is moving, widening, or tied to a structural issue needs a structural repair specialist, not a tube of filler.
Specifications
| Product Type | Ready-to-use, cement-based, polymer-enriched crack filling paste |
| Maximum Crack Width | Up to 4 mm |
| Application Temperature | 5°C to 45°C |
| Touch-Dry Time | 30 minutes in dry/hot weather; up to 24 hours in humid/wet weather |
| Recommended Drying Before Painting | 24 hours (longer in humid conditions) |
| Pack Sizes | 50 g & 90 g (White, Cream, Light Yellow, Light Blue); 40 g & 70 g (Transparent) |
| Coverage (90 g pack) | Approx. 37 running feet of crack, 2 mm wide x 1 mm deep |
| Colours Available | White, Cream, Light Yellow, Light Blue, Transparent |
| Shelf Life | 24 months from manufacture; use within 6 months of opening |
Industry use cases
Residential handover & snagging
Fixing hairline plaster cracks, nail holes, and frame gaps in new flats and villas during the final punch-list before possession.
Interior painting contractors
Standard pre-paint touch-up across walls and ceilings before priming, so hairline cracks don’t telegraph through the finish coat.
False ceiling & gypsum partition work
Sealing joint lines and screw heads on POP or gypsum ceilings and partitions before they’re painted.
Renovation & repainting projects
Quick touch-up of aged hairline cracks in apartments and offices at the start of a repaint cycle, without a full plaster redo.
Interior tile, marble & granite fit-out
Cosmetic touch-up of fine edge and joint lines on indoor tile, marble, and granite surfaces.
Frequently asked questions
How wide a crack can this actually handle?
Can I use it on an exterior wall or in a bathroom?
Do I need to mix anything before applying it?
How soon can I paint over it?
Does the transparent variant actually stay clear?
How long does a tube last once it’s opened?
How we position UltraTech Crack Filler
This is a finishing-stage, cosmetic product, and it’s worth being upfront with clients about where it stops. For cracks that are actively moving, structural, or tied to a deeper concrete defect, it needs to be paired with a proper structural repair mortar rather than used as a substitute — that’s a different job entirely. For cracks on exterior walls or anywhere water is a factor, look at UltraTech’s waterproofing coatings instead, since this product carries no waterproofing rating at all. Within the same UltraTech range, it sits alongside the brand’s tile and wall-care products for a coordinated interior finishing package, and on the same site, Space Arc’s Fosroc structural repair mortars cover the wider and deeper defects this tube was never meant to fill.
Fosroc Fosroc Nitomortar FC — Not a like-for-like swap — Nitomortar FC is a two-component, solvent-free epoxy fairing coat used to fill pinholes and surface irregularities up to 3 mm on structural concrete ahead of overcoating. Reach for it when the defect is on bare concrete and needs a trowel-applied, engineered repair rather than a cosmetic tube fix on finished plaster.
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