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HYDROFLEX   |   Matryx

Cementitious Products


Waterproof protective coating

Hydroflex is a highly elastic, crack bridging, UV stable, tropical grade, waterproof and protective coating. Cementitious based with a synthetic resin additive.

sa flag Manufactured in SA for SA conditions Download data sheet

Fields of Application

  • Under tile waterproofing, bathrooms and balconies
  • Parapet walls, flower boxes and fish ponds
  • Corrosion protection, damp and waterproofing to:
    - Beams & columns
    - Concrete ceilings and walls
    - Bridges, silos and concrete towers
    - Most civil structures
    - Farm dams and reservoirs
  • Planter boxes


  • Crack bridging capability up to 1,2 mm @ 20°C
  • High flexibility and long term durability
  • Resistant to carbonation and the ingress of chloride ions
  • Protects reinforced concrete against corrosion
    (concrete repair systems)
  • 100 % waterproof but permeable to water vapour
  • Excellent adhesion to most substrates
  • Weather resistant and UV stable in tropical conditions
  • Available in concrete grey
  • Safe for contact with food and potable water
  • Self priming


Surface preparation

  • A clean, sound structure is required. Remove all oils,
    stains and imperfections.
  • It may be necessary to high pressure clean @ min. 120 bar
    pressure and thoroughly rinse the surface and/or skim the
    substrate with Lanko Rep FC.
  • The substrate must be dampened prior to application, leave
    no standing water. Do not dampen between coats; remove
    any condensation water with a clean cloth.
  • No additional priming is required on sound cement
    based substrates.
  • Apply the product with a painter's block brush or quality
    mohair roller - can be spray applied.
  • Apply two coats of Hydroflex, waiting for the first coat to
    set-up before applying the second, so as not to draw off the
    first; between 4 - 24 hours is suitable.
  • Each coat should be applied at a rate of 1,5 kg/m2 minimum.
  • Apply the first coat in a vertical motion and the second
    horizontally in order to effectively eliminate the possibility
    of pinholes.
  • The total thickness of the coating should not exceed 2 mm
    in thickness.
  • The final coat can be smoothened using a putty knife or
    a steel trowel.
  • Mortar must be used within 20 minutes of preparation (25°C)

(further information available on the data sheet)


Technical Data

Packaging 15 kg kit, A+B components (A=4,8 kg; B=10,2 kg)
Curing time touch dry 30 minutes at 25°C ambient, full cure = 7 days
Specific gravity 1,7 kg per litre
Coverage 1,5 - 2 kg/m2/mm thickness
DFT 1 mm per coat unreinforced
Colour Concrete grey
Toxicity Non toxic when mixed and fully cured
Shelf life 12 months from date of manufacture if stored unopened in original packaging in dry, frost and moisture free conditions.
Bond strength
as per EN 1542
0,9 N/mm2@ 20°C
Cracking bridging
as per ASTM C836
1,2 mm @ 20°C
Resistance to water pressure
as per DIN 1048
Positive: 1,2 MPA
Negative: 0,5 MPA

Specifications are subject to change without notification. Results shown are typical but reflect test procedures used. Actual field performance will depend on installation methods and site conditions.

Download data sheet




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