Mapei Lamposilex (Waterplug)

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

1. Surface Preparation: Cut out and clean the leaking area to remove any loose or weak material.
2. Mixing: Add clean water to the powder to form a stiff, workable paste (only mix what can be used in 1 minute).
3. Application: Press the paste firmly into the leak using a gloved hand. Hold in place until fully set.
4. 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.