Sika FastFix
A brush-in, self-setting jointing compound that locks paving joints against weeds, ants and wash-out while staying water permeable.
What is it?
A ready-to-use, single-part jointing compound for filling the joints between paving units. You sweep it in and set it with moisture; no cement mixing, no sand batching.
Where is it used?
External hardscape joints on flagstones, Indian sandstone, stone setts, block paving, slabs and cobbles across footpaths, patios, plazas and light-traffic driveways.
Why use it?
It cures to a firm-but-flexible joint that will not wash out, shrink or crack, blocks weed and ant ingress, and stays water permeable so surface water drains instead of pooling.
How is it applied?
Fill only clean, correctly sized joints, brush the compound fully in, compact hard, then cure. The moisture-cure grade is watered in; the self-setting All Weather and PaveFix grades set on their own moisture and can be worked even in the rain.
About Sika FastFix
Sika FastFix is Sika’s family of proprietary paving jointing compounds, made to solve the one job ordinary sand-and-cement pointing does badly: keeping the gaps between paving units filled, tidy and weed-free for years. Instead of a wet mortar that has to be gauged, buttered in and struck, FastFix arrives ready to use in a bag or pail. The installer sweeps it into the joint, compacts it, and cures it with water or ambient moisture. The result is a joint that sets hard yet stays slightly flexible, so it moves with the paving through daily thermal and traffic cycles rather than debonding and popping out.
The range covers three closely related grades so a specifier can match the exposure. FastFix-131 is a moisture-curing, brush-in compound for joints 2 to 12 mm wide and at least 25 mm deep, walkable immediately and trafficable in one to two days. FastFix-132 PaveFix is a self-setting grade for joints over 5 mm wide and at least 25 mm deep that needs no separate watering step. FastFix All Weather is the most robust grade, built with Sika’s Active Resin Technology for joints over 5 mm wide and 20 mm deep; it can be applied even in the rain, stays highly water permeable, and can be reopened and reused for up to a month if stored immersed in water. All three share the same promise: no wash-out, no shrink-crack, and a built-in barrier to weed growth.
The technical insight
The reason FastFix outlasts hand-mixed pointing comes down to how it cures and how it flexes. Conventional sand-cement mortar in a narrow paving joint is brittle and shrinks as it dries, so hairline cracks open, water tracks in behind it, and freeze-thaw or foot traffic then levers the joint loose. FastFix instead uses a resin-modified, moisture-activated binder that hardens into an elastomeric-yet-firm matrix. That controlled flexibility lets the joint absorb the small differential movements between adjacent slabs without fracturing, while the cured binder is dense enough to resist wash-out from rain and hose-down and to deny weed roots and ants a foothold. Just as important, the set matrix remains water permeable, so rainfall drains down through the joint into a well-drained bed rather than sheeting across the surface or ponding, an advantage over rigid impermeable mortar that traps water at the surface. Because the compound only needs moisture to trigger cure, the self-setting grades can be placed in damp or rainy conditions that would ruin a fresh cement joint, which is what makes FastFix practical on Indian sites where a clear dry window is rarely guaranteed.
Where it is used
- Jointing natural stone patios and terraces in Indian sandstone, limestone and granite flags
- Pointing block-paved and slab-paved footpaths, walkways and garden paths
- Filling joints in stone setts, cobbles and sett-paved courtyards and plazas
- Light-traffic residential and commercial driveways laid in blocks or flags
- Landscape and public-realm hardscape around campuses, hotels and townships
- Re-pointing existing paving where old sand joints have washed out or grown weeds
- Roof-terrace and podium paving joints where a permeable, non-wash-out fill is needed
- Poolside, courtyard and pavement joints exposed to frequent wetting and hose-down
Key advantages
- Ready to use straight from the bag or pail; no cement gauging, no sand batching, no on-site mixing
- Sets hard but stays flexible, so joints resist shrink-cracking and stay intact under traffic
- Will not wash out under rain or hose-down once cured, unlike loose sand jointing
- Highly water permeable, letting surface water drain away instead of ponding on the paving
- Built-in barrier to weed growth and, on the 131 grade, ant infestation
- All Weather and PaveFix grades can be applied in wet or rainy conditions, widening the work window
- Fast to place and cure; the moisture-cure grade is walkable immediately and trafficable in 1 to 2 days
- All Weather grade can be reopened and reused for up to a month if stored immersed in water, cutting waste
Limitations & considerations
- It is a decorative and functional paving joint filler, not a structural repair mortar, grout or load-bearing bedding material
- Needs a minimum joint depth (20 mm for All Weather, 25 mm for 131 and PaveFix) and a minimum width, so very shallow or hairline joints cannot be filled reliably
- Full performance depends on a well-drained paving bed; standing water under the paving undermines the joint
- Not suited to tapered joints or porcelain pavers (All Weather), where cracking or poor adhesion can result
- On some porous natural stone it can highlight colour or texture and, if overworked at joint edges, may stain light-coloured paving; a trial patch is advised
- Colour choice is limited to Sika’s standard shades (buff, grey and the All Weather range), so it will not match every stone exactly
Selection & best practice
Success with FastFix is decided before the compound goes in. Confirm the paving bed drains freely and the joints meet the minimum depth and width for the grade you are using, then make sure every joint is clean, weed-free and free of standing water. For the All Weather grade, wet the whole area including the slab faces and let surplus water drain off first. Work in small, manageable amounts, keep the material loose by raking through it, and never break up and reuse set lumps or add extra sand. Brush the compound fully into each joint and, critically, compact it hard with a pointing trowel, wood plank or vibrating plate; under-compaction is the most common cause of a joint that later fails. Water the moisture-cure 131 grade in thoroughly after filling. Once opened, punctured self-setting packs must be used within about an hour. Protect fresh joints from heavy rain until set, keep pressure washers off the joints for at least 14 days, and always trial an inconspicuous area first on light or porous stone.
Specifications
| Product type | Ready-to-use paving jointing compound (moisture-curing / self-setting) |
| Joint width (131) | 2 to 12 mm wide, min. 25 mm deep |
| Joint size (132 PaveFix) | Over 5 mm wide, min. 25 mm deep |
| Joint size (All Weather) | Over 5 mm wide, min. 20 mm deep |
| Initial set (All Weather / PaveFix) | 6 to 12 hours above +15 degrees C in dry conditions |
| Full set (All Weather) | Up to 5 days at +4 to +15 degrees C |
| Trafficable (131) | Walkable immediately; trafficable in 1 to 2 days |
| Colours | Buff / Grey (131, 132); Deep Grey, Dark Buff, Stone, Flint, Charcoal (All Weather) |
| Pack size | 20 kg bag (131); 15 kg (132 PaveFix); 14 kg / 15 kg pails (All Weather) |
Industry use cases
Landscape & Public Realm
Jointing natural-stone and block paving across campuses, hotels, townships and public plazas, where a weed-free, wash-out-resistant finish has to stay presentable for years.
Residential Hardscape
Patios, garden paths and light-traffic driveways in Indian sandstone or block paving, where homeowners want a clean joint that does not sprout weeds or wash away in the monsoon.
Commercial & Hospitality
Courtyards, entrance forecourts and poolside paving at hotels and offices that see frequent wetting, foot traffic and hose-down cleaning.
Heritage & Restoration
Re-pointing sett, cobble and flagstone paving in restored courtyards and streetscapes where a flexible, non-staining joint that matches traditional buff or grey tones is needed.
Roof Terraces & Podiums
Paving joints over waterproofed podium and terrace decks where a permeable fill lets water reach the drainage layer instead of ponding on the surface.
Frequently asked questions
Is Sika FastFix a repair mortar or grout?
Which FastFix grade should I choose?
Can it be applied in the rain or the monsoon?
Will it stop weeds growing between the paving?
What joint depth and width does it need?
Does Space Arc supply and apply Sika FastFix across India?
How we position Sika FastFix
Sika FastFix sits in our joint-treatment range as the go-to answer for decorative paving joints, not structural work; keep it clearly distinct from repair mortars and grouts. Within the Sika family it pairs naturally with Sika primers and paving-related products, and the three grades (131 moisture-cure, 132 PaveFix self-setting, and All Weather) let you step exposure up or down on the same job. Where a project moves from decorative paving joints into engineered movement joints in concrete pavements, carriageways or aircraft hardstandings, that is a different specification altogether and calls for a pourable elastomeric road sealant such as Fosroc Colpor 200PF from our Fosroc range. For building movement and expansion joints, our polyurethane and MS-polymer sealants (for example Fosroc Nitoseal MS600 or Nitoseal PU40) are the correct cross-sell rather than a paving jointing compound.
Fosroc Colpor 200PF — Specify Colpor 200PF instead when the joints are engineered movement joints in a concrete pavement, carriageway or hardstanding that must accommodate cyclic movement and resist fuel or oil, rather than the decorative hardscape joints FastFix is built for.
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