Cementitious Waterproofing

Monneli Kretesil FLEX

Elastomeric Additive for KRETESIL

Swimming pools
Purification plants dams
Foundation wall
Prefabricated cisterns
Canals concrete pipes
Water tanks
Humid rooms
Elevator shafts
Inspection pits
Retaining walls
Lift shafts
Bridge decks
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Technical Information
Product Description

KRETESIL FLEX is a product composed of water based synthetic elastomer to be mixed with KRETESIL. This additive provides the mix with flexibility and waterproofing characteristics. Therefore, the coating will absorb possible support deformations, minor cracks, will have higher resistance against abrasion and will strongly adhere to the surface.

  • Flexible and can absorb minor deformations
  • Used for internal and external applications
  • Used for positive and negative pressure
  • Excellent bond to concrete and block work
  • Easy to apply by brush or spatula
  • Non-toxic
Packaging, Coverage / Consumption

KRETESIL FLEX supplied in 20 Liter plastic pails.

Consumption: 2.0 kg of KRETESIL mix per 1m² depending on the surface roughness and porosity.

Shelf Life & Storage

Should be stored under cover away from extreme heat and direct sunlight. Shelf life is 12 months if stored in tightly sealed containers under good storage conditions

Technical Properties

White liquid

Density at 25ºC

1.05 kg /L


10.0 g/L

Results of Mixing KRETESIL with KRETESIL FLEX


Workability time at 25ºC

40 minutes

Adhesion to concrete

> 1.0 N/mm²

Water Permeability


Elongation at Break

Up to 50%

Chloride Ion diffusivity

Not measurable after 24 months testing

Noxiousity according to ECM 88/379


Service Temperature

from –5ºC to +80ºC

Application Information
Instructions for use


Mix one 25 kg bag of KRETESIL with 5-5.5 Liters of KRETESIL FLEX for applications with spatula and with about 6 Liters for brush applications.

Use a mechanical mixer at low number of turns. Mix till obtaining a homogeneous mixture free from lumps.

Let the mixture rest for about 5 minutes, and remix
again shortly before application.


KRETESIL mix can be applied with a brush or with spatula, for application with a brush, 2 coats are required. Before the second coat is applied make sure that the first one has hardened which generally takes place after about 5 – 6 hours according to the temperature and the porosity of the support, but do not exceed 24 hours.


Clean the tools immediately after use with clean water. During work, it is recommended to place the tools in water while not in use.


  • KRETESIL mixed with KRETESIL FLEX forms a cementitious product, so all the precautions for concrete practice must be followed
  • During windy or sunny days, damp the surface to avoid the rapid evaporation of water
  • Do not apply at a temperature below to +5ºC.
  • Allow concrete supports to cure for 28 days
  • Cannot be used on substrate with possible moving cracks.
  • The maximum thickness to be applied is 1 mm per coat, with both spatula or brush
  • Do not apply excessive thickness to avoid possible cracks appearance
Surface Preparation

The surface of the concrete shall be sound, clean and uncontaminated.

This preparation shall be such as to leave a sound exposed concrete surface free from dust, loose particles and any deleterious matter. If the concrete surface is defective or has laitance, it must be cut back to a sound base.

Moss and lichen must be removed physically followed by treatment with fungicidal wash. After treatment, it must be washed down thoroughly with clean water.

In addition, make sure that all surfaces must be damp but not totally wet before progressing the work.

Additional Information
Health & Safety

During application, wear appropriate protective clothing, goggles, gloves and respiratory equipment if necessary.


In case of contact with skin, rinse with water and again wash thoroughly with soap and water. In case of contact with eyes, rinse with plenty of water and seek medical advice accordingly.


If ingested, obtain medical attention immediately. Do not induce vomiting.

Important note

The information in this Technical Data Sheet is based on Colmef Monneli’s experience. Colmef Monneli does not accept any liability arising from the use of its products as it has no direct or continuous control over where or how its products are applied. All Colmef Monneli’s Data Sheets are updates on regular basis. It is the user’s responsibility to obtain the latest version.

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