Rapid-Setting Hydraulic Plug for Sealing Active Water Leaks. Mapei Lamposilex is a rapid-setting, cement-based hydraulic mortar designed to instantly stop water ingress through cracks, joints, or holes in masonry and concrete structures. Commonly referred to as a "waterplug," Lamposilex expands as it sets, creating a mechanical seal even under pressure. It is ideal for use in waterproofing applications where active leaks need immediate control — including basements, tunnels, tanks, and foundations.. Key Features & Benefits. Instant Leak Sealing: Stops active water flow within seconds of application.. Expanding Seal: Expands during curing to tightly seal against water pressure.. Fast Setting Time: Sets in 2 minutes or less, depending on ambient temperature.. High Strength: Once cured, forms a durable and permanent seal resistant to pressure and moisture.. Compatible with Waterproofing Systems: Can be overcoated with tanking slurries or membranes such as Biokil Crown Toptank or Newton 508.. Product Details. Brand: Mapei. Type: Hydraulic cement-based plugging mortar. Form: Pre-blended powder (just add water). Colour: Grey. Setting Time: Approx. 2 minutes. Application Method: Hand-applied by gloved fingers or trowel. Coverage: Variable depending on void size (refer to technical datasheet). SKU: LAMPO5. Application Instructions. Surface Preparation: Cut out and clean the leaking area to remove any loose or weak material.. Mixing: Add clean water to the powder to form a stiff, workable paste (only mix what can be used in 1 minute).. Application: Press the paste firmly into the leak using a gloved hand. Hold in place until fully set.. Finishing: Once the leak is sealed, surface can be finished or overcoated with waterproofing systems as required.. Limitations. Only suitable for localised repairs and sealing. Not a substitute for full waterproofing systems.. Do not apply below 5°C or onto frozen or contaminated surfaces.. Health & Safety. Contains cement: avoid inhalation of dust and contact with skin or eyes. Use gloves and goggles during mixing and application. Refer to the Safety Data Sheet (SDS) for full guidance.
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