Two-component, Cement Based, Fast Drying and Flexible Waterproofing Slurry


Product Features Surface Preparation Application Documents


  • Two-component waterproofing material which is specially formulated with cement for fast drying and minimization of the drying period between application coats.
  • K11 Flex Rapidex is manufactured with Dust Less Technology for the enhancement of air quality, minimization of dust and reduction of onsite cleaning period.
  • K11 Flex Rapidex can be applied on damp surfaces. It is ideal for wet areas and many other places requiring waterproofing
  • K11 Flex Rapidex is also an ideal repair material for the correction of cracks up to 2 mm width.


  • Ideal material for bathroom restoration projects where time is of essence.
  • Waterproofing on walls, tiles, swimming pools, kitchens, toilets, balconies, terraces and water tanks.
  • Protection of light blocks, floor tiles and gas blocks.
  • Adherence bridge for various materials.
  • Flower bed insulations.

Technical Information
  • Elongation at break: 150%
  • Tensile strength: > 1,7 N/mm2 (ASTM 4541)
  • Tensile strength on concrete: > 1,0 N/mm2 (ASTM 4541)
  • Shore A Hardness: > 40 (ASTM D2240:91)
  • Water resistance of concrete: > 7 coat 0,2 kg/cm2
  • Chemical strength: NaOC - %0,5 NH4OH - %25 HCL - %3,7
  • Crack bridging: 2mm
  • Pot life: Approx. 1 hour at 25oC
  • Drying period: Approx. 1-3 hours at 25oC
  • Touch dry: Approx. 1 hour at 25oC
  • Walkability: Approx. 2-3 hours at 25oC
  • Water test: Approx. 3 hours
  • Depends on + 23 ± 2°C temperature and 50 ± 5% relative humidity conditions.

Surface Preparation

  • Any protrusions or matters which may damage the product must be removed
  • All surfaces must be cleared of dirt, dust, oil, curing components and any residuals.
  • All gaps, cracks and edges are repaired with Lanko 731 or other suitable repair materials.


  • Pour K11 Flex Rapidex liquid product in a clean mixing container.
  • Slowly add K11 Flex Rapidex powder component while mixing to ensure full plastic stability.
  • The mixture must be stirred for 2-3 minutes to ensure proper distribution of the components.
  • Dampen the surface with water beforehand.
  • Do not allow water accumulation. Very porous surfaces must be primed with Lanko 160 prior to the application of K11 Flex Rapidex.
  • Apply the mixed material to the prepared surface with the help of a brush or roll.
  • Apply two coats depending on the conditions available at the area and required film thicknesses. In case of using a spud for the application, all wavy or irregular surfaces must be repaired prior to the application of K11 Flex Rapidex.
  • In this way thickening of the material prior to the application will be prevented.
  • The 1st coat must be ventilated for about 1-1,5 hours before the application of the 2nd coat.
  • Actual drying period will vary by the applied thickness, roughness of the surface and ambient temperature.
  • The surface subjected to the application of K11 Flex Rapidex must be protected.
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