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Hard Flexpren Liquid Membrane Liquid membrane for waterproofing internal areas

HARD FLEXPREN is a liquid waterproofing membrane for indoor areas that is ready for use. Developed in MS Polymer® technology, it delivers high performance, increased productivity and excellent grip. After applied forms a waterproof membrane and high elasticity.

For application in slabs and other external areas, mechanical protection (ceramic, stone or counter-laying) is required.


  • Ready-to-use product (single component, no need for dilution in water or solvents).
  • Easy to apply. With brush, brush, microfiber roller, brush or squeegee.
  • Greater speed in the application of the second coat (between coats of 2 to 3 hours).
  • Greater flexibility, replacing conventional acrylic and cement blankets.
  • Free from solvents, isocyanate or styrene.
  • No need for primer.
  • No need to use a torch, replacing the asphalt blanket.
  • Accepts application of adhesive mortar for floor laying.
  • It can receive mechanical protection (subflooring, ceramic laying).

Main Applications

  • Waterproofing of bathrooms.
  • Waterproofing of wet areas in kitchens and laundries.
  • Waterproofing of flower planters.
  • Elevator shaft waterproofing.
  • Waterproofing of reuse water tanks.
  • Waterproofing of slabs with mechanical protection. Ceramic, stone or subflooring laying.
  • Waterproofing of floors and walls.
  • Drywall waterproofing.
  • Waterproofing of balconies.
  • Waterproofing of swimming pools with ceramic laying.
  • Joint bottom waterproofing.
  • It can be applied to concrete, wood, fiberglass, and ceramic materials.

HARD FLEXPREN is a high-performance, low-viscosity, liquid blanket developed in MS Polymer technology for waterproofing and sealing internal areas. After application, it forms a waterproof, highly elastic and adhesive membrane. It does not contain solvents, isocyanate and styrene and is environmentally friendly.


Available in a 4kg can, in the colors gray and black.

  • Consistency: Self-leveling
  • Working time: 2 to 3 hours (between coats)
  • Final cure: 24 hours (for applications with mechanical protection wait 72h)
  • Density: 1.60 g/cm³
  • Application temperature (surface): 5°C to 40°C
  • Validity: 12 months

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