SikaTop®-590 Seal – Fast Setting Water Plug Mortar to Stop Active Water Leaks

Key Advantages

• Ultra-rapid set — plugs active leaks instantly, final set in 2–4 minutes
• Just add water — one-component grey powder, no special additives needed
• Expands as it sets — compresses against the substrate for a permanent watertight seal
• Works against flowing water — where normal mortar washes away and resins won't bond
• Concrete-compatible — similar characteristics to concrete once cured
• Chloride-free — safe for reinforced concrete, does not promote rebar corrosion
• High early strength — over 12 MPa compressive strength in just 30 minutes
• Fire classification A1 — non-combustible

Where to Use SikaTop®-590 Seal

• Stopping active water leaks or seepage under pressure through joints, cracks, and holes in concrete or masonry
• Basement leak repair — sealing construction joints and floor/wall junctions prior to basement tanking
• Water tanks, reservoirs, and water-retaining structures — sealing cracks and construction joints
• Instant sewer connections and joint filling between concrete segments in tunnels, sewage systems, pipes, and mines
• Rapid anchoring of bolts, railings, conduits, pipes, gates, and sanitary equipment — set in minutes, no waiting overnight
• Filling holes, blisters, honeycombing, and construction faults in concrete walls

How to Use SikaTop®-590 Seal (Application Guide)

Step 1 – Prepare the Crack or Hole Cut the crack or hole to a minimum of 20mm × 20mm width and depth, with the sides as square as possible — undercut where you can, and never leave a V-shape or feather edge. For anchoring bolts, drill the hole deep enough for the bolt with at least 10 mm clearance all round. Flush out all dust and loose particles with clean water, and dampen all surfaces immediately before applying.

Step 2 – Mix (Small Batches Only!) Mix the powder by hand with clean water at approximately 0.24 litres per kg to a stiff consistency. Mix quickly — pot life is only 1–2 minutes, so mix only what you can place in one go. Never re-temper (re-wet) material that has started to harden.

Step 3 – Plug the Leak Hold the mixed mortar in a gloved hand until you feel slight warmth or initial setting begin. Then press it firmly into the opening with full pressure and hold — without moving — for at least 1 minute. For large openings, work progressively from the sides toward the middle with successive mixes. Once the water is stopped, trim the patch flush with the wall.

Step 4 – Floor/Wall Junction Sealing (Coving) For sealing the joint between floor and wall, force the mortar into the prepared groove and shape a 45° cove/fillet approximately 35–45 mm at the junction using a round-nosed tool.

Step 5 – Anchoring Bolts & Posts Fill the hole completely with mortar, tamp it down, then immediately centre the bolt or post and force it into the mortar. Tamp firmly around it — the anchor is set within minutes.

Step 6 – Cure Final set occurs in 2–4 minutes. Once stiffened, dampen the repair with clean water and keep it damp for at least 15 minutes. Clean tools with water immediately — hardened material can only be removed mechanically.

FAQ section 

Q: What is Sika 590 Seal used for? A: SikaTop-590 Seal is an ultra rapid setting mortar used to instantly stop active water leaks through cracks, holes, and joints in concrete and masonry — including basements, water tanks, reservoirs, and sewers. It is also used for rapid anchoring of bolts, railings, and pipes.

Q: How fast does Sika 590 Seal set? A: It sets in just 2–4 minutes, with a working (pot) life of only 1–2 minutes. It reaches over 12 MPa compressive strength within 30 minutes.

Q: Can Sika 590 Seal stop water that is actively leaking? A: Yes — that is its main purpose. It expands as it sets, forming a permanent watertight seal even against flowing water under pressure, where normal mortar would wash away.

Q: How do you mix Sika 590 Seal? A: Mix the grey powder by hand with clean water only, at roughly 0.24 litres of water per kg of powder, to a stiff consistency. Mix only small amounts you can place within 1–2 minutes.

Q: What sizes does Sika 590 Seal come in? A: It is available in 5 kg and 25 kg metal pails at both Shabbiri Hardware branches — Magadi Road Ongata Rongai and Tuala past Nazarene University. Call 0741 042484 or 0745 554008 for current prices.

Q: Is Sika 590 Seal the same as MSeal 590? A: Yes — SikaTop-590 Seal is the new name for the product formerly sold as MSeal 590, following Sika's acquisition of the MBCC/Master Builders range.

Why Buy SikaTop®-590 Seal from Shabbiri Hardware?

Shabbiri Hardware Kenya Limited has been supplying builders, plumbers, contractors, and homeowners since 1990. We stock genuine Sika construction chemicals alongside cement, steel, waterproofing products, roofing, flooring, and the full range of building materials — with honest advice on choosing the right product for your leak, tank, basement, or anchoring job.

Visit Us:

• Branch 1: Magadi Road, Ongata Rongai
• Branch 2: Tuala, past Nazarene University, Magadi Road

Call / WhatsApp: 0741 042484 | 0745 554008

Email: info@shabbirihardware.com 

 Website: www.shabbirihardware.com

Serving Ongata Rongai, Tuala, Kiserian, Karen, Langata, Ngong, Kajiado, and the greater Nairobi area. Countrywide delivery available.