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Betec Flex S150


Betec® Flex S150 is a flexible, two-part, polymer-modified cementitious waterproofing system. The two components of Betec Flex S150 are mixed together with a slow speed drill and paddle to form a smooth slurry. The slurry is applied by trowel or brush, in two coats, to form a hard but flexible waterproof cementitious coating.

Betec Flex S150 can be applied onto damp substrates, internal and external wet areas. The cured membrane is flexible, durable, weather-resistant, and has excellent adhesion to most substrates.


  • Floor, basement wall and slab
  • Swimming pool, water feature
  • Bathroom, balcony, wet area and planter box
  • Water-retaining structure
  • Parking deck
  • Sealing pre-cast joint

Product Advantages

  • Resists both positive and negative pressure
  • Flexible – will bridge drying shrinkage and hair line cracks
  • Seals lightweight aerated blocks and pre-cast joints
  • Excellent adhesion to concrete, masonry, ceramics, and most common substrates and does not attack metal
  • Non-toxic
  • Able to take foot traffic when cured
  • Direct plaster or screed without affecting bond


Surface Preparation

  • Chase out all holes and voids and fill with appropriate Mortar from GCP Applied Technologies to provide a smooth and level surface; mortar joints should be flush pointed.
  • Remove all bitumen, oil, grease, dirt and other surface contaminants by wire brushing and pressure washing. Cut back any protrusions.


  • Shake the liquid well and pour around 75% into a clean mixing container.
  • Slowly add the Betec Flex S150 Powder while mixing.
  • Mix until a homogenous slurry, free from all lumps, is formed.
  • Scrape any unmixed material from the side of the mixing container with a trowel and mix in.
  • Finally, add the appropriate amount of the remaining liquid to achieve the required consistency for application.
  • It is recommended that mechanical mixing (400 to 500rpm) should be used for 2 to 3 mins to ensure proper dispersion of the components.
  • Pre-wet the surface with clean water. Do not allow pooling or ponding.
  • Apply the first coat of Betec Flex S150 mixed materials onto the prepared surface using a brush, trowel, squeegee or roller in a stifling action.
  • Apply the second coat finish depending on site conditions and film thickness required.
  • Before applying the second coat in alternate direction, leave the first coat to dry for approximately 2 to 4 hours depending on the thickness.
  • If overcoating is done more than 24 hours after applying the previous coat, or the previous coat has already dried out, the surface must be pre-wetted again.

Typical Properties

Tensile Strength ≥ 1.8N / mm2 ASTM D412
Elongation ≥ 200% ASTM D412
Adhesion to Concrete ≥ 1.2N / mm2 ASTM D4541
Crack Bridging Capability up to 2mm Pass ASTM C836
No Crack after 10 Cycle of Stretching and Closing at 1mm Width Pass ASTM C836

Typical test values represent average values from samples tested in recommended conditions. Refer to Technical Letter 1 for more information.


Pack Size 42kg set
Powder Component 25kg
Liquid Component 17kg
Shelf Life 12 months storage in dry condition


All tools and equipment should be cleaned immediately with clean water after use. Hardened material can only be removed mechanically.

Coat Thickness and Consumption

Thickness per coat 0.6mm
Coat consumption (min 2 coats) Approx. 24m2

Technical Services

For assistance with working drawings for projects and additional technical advice, please contact GCP Applied Technologies.

Health and Safety

Betec Flex S150 is classified as non-hazardous. Read the product label and Material Safety Data Sheet before use. Protect hands with rubber gloves. Avoid contact with eye and skin. In case of contact, wash immediately and thoroughly with water and seek medical advice.