Wykamol HydraFlex - Flexible Tanking Slurry

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Wykamol HydraFlex - Flexible Tanking Slurry

Wykamol Group | Tanking Slurry

HydraFlex Tanking Slurry is a two-component FLEXIBLE Coating made of a cementitious powder and a high concentration liquid polymer which, when mixed together provides, permanent waterproofing for concrete and masonry. HydraFlex Tanking Slurry also provides a protective waterproof barrier which can bridge cracks in the substrate so the coating remains water tight.

Supplied as 15kg Bags of Cementitious Powder with additional 5kg Bottle of Polymer to make 20kg of Slurry Mixture, all supplied in a bucket which can be used for mixing. Available in Grey colour only.


HydraFlex Flexible Tanking Slurry

HydraFlex Tanking Slurry is a two-component FLEXIBLE Coating made of a cementitious powder and a high concentration liquid polymer.

HydraFlex Tanking Slurry can be applied to mineral substrates, such as concrete and masonry, to provide a protective waterproof barrier which can bridge cracks in the substrate so the coating remains water-tight.

With superior crack-bridging ability down to -5°C, as well as thixotropic application properties, HydraFlex Tanking Slurry is a suitable solution for areas at risk of movement in both internal and external environments.

Typical Applications:

HydraFlex Tanking Slurry is used for Waterproofing of areas subject to vibration or minor substrate movement that are constructed of concrete, brickwork, or stone.

These areas include:

  • Basements

  • Cellars

  • Foundations

  • Lift Pits

  • Water Tanks

  • Constructions Joints (Wall to Floor Junctions)

  • Podium Decks

  • Balconies / Terraces

  • Flat Roofs

Product Benefits:

  • Permanent waterproofing for concrete and masonry.

  • Superior crack-bridging capability, even at sub-zero temperatures, making it ideal for high-risk areas.

  • Resists both positive and negative water pressure.

  • Recommended for both internal and external use.

  • Bag and bottle system ensures accurate and simple mixing.

  • Versatile product which can be used in a variety of areas.

  • Excellent adhesion to well-prepared mineral substrates, even when damp.

  • Exceptional workability, providing easy application on vertical and overhead surfaces.


Health & Safety Recommendations:

Take the usual labour hygiene into account.

PPE should be worn during application. See our Safety & PPE Products.

Consult label and material safety data sheet for more information.

Substrate Preparation:

All active water leaks must be stopped using HydraDry Waterstop (Rapid Setting Plugging Compound) before continuing to the next stage of application.

Uneven Surfaces

This includes non-flush pointed brickwork.Remove by suitable means, all loose pointing, any remaining render or plaster, wood, dust, grease, oil, organic growth or other foreign materials that may cause contamination or adversely affect adhesion properties. To create a level surface, Universal Mortar should be applied in line with the relevant data sheet, which is available upon request or can be downloaded from our website. Follow the Universal Mortar priming requirements before application.

Level Surfaces

If there is any exposed steel present, apply two coats of suitable corrosion inhibitor to the exposed steel, by brush. Remove all loose material and surface latencies, i.e. dust, oil, grease, corrosion and organic growth, preferably by using wet grit or water blasting techniques. The strength of the concrete sub-base must be a minimum of 25N/mm².

Note: Special precautions may be necessary to ensure a continuous waterproof barrier at the wall to floor joints and corner joints. This is to avoid sharp changes of angle in the tanking membrane. The joints should be thoroughly raked out and cleaned prior to an application of Universal Mortar as a Fillet Seal, this should be applied in line with the relevant data sheet.

Priming (If Necessary)

  • Using a brush, roller or spray, apply SBR Bonding Agent, mixed 1:1 (by volume) with water.

  • Allow to become tacky to the touch. Approximately 30 minutes time.


  1. Remove contents from bucket.

  2. Shake Polymer B and then let it settle for 10-20 seconds.

  3. Pour Polymer B into empty bucket.

  4. Using an electric paddle, gradually start to add Powder A into bucket whilst mixing under low shear to reduce dust generation.

  5. Add all Powder A and increase mixing shear so vigorous mixing is achieved.

  6. Mix for approximately 2 minutes, stop to scrape the powder stuck to the sides of the mixing vessel back into the mix.

  7. Mix for a further 1 minute to achieve a uniform, lump free product.

  8. Tap water can now be added into bucket, and mixed in, to provide the desired consistency.
    A maximum of 0.5L of tap water can be added without affecting the crack-bridging properties.

Note: The user must not include any additional components of their own into this product, e.g. sand, cement, etc. It will dramatically impact the properties of this product.


Application Methods:

After mixing HydraFlex has a pot life of 40 minutes.

Apply a tight coat of HydraFlex by Tanking Brush, trowel, or roller to a minimum thickness of 1 mm in the first layer.

It is essential the first coat is well worked into the substrate, free of entrapped air as far as possible, and is applied in one continuous direction.

Allow the first coat sufficient time to cure to a state where it will accept the second layer (approximately 5 hours at standard room temperatures, longer at lower temperatures).

  • HydraFlex can accept light foot traffic after 24hrs.

  • No more than 48 hrs should be allowed between coats.

Apply a second coat of HydraFlex at a 90° angle to the first, ensuring complete coverage and a minimum overall thickness of 2mm.


A 20Kg of HydraFlex Tanking Slurry should cover approximately 6m² based on two coats.


Substrate and ambient temperature must be over 5°C at time of application and for the following 24 hours.

Avoid application in direct sunlight to prevent rapid drying out.

Aquatic environments should be finished with Technoseal DPM.

Not tested for use in swimming pools or in contact with potable water.

If product is used in an external environment it should be covered after 72 hours and not left as the final finish.

Gypsum plaster must not be used in direct contact with HydraFlex.

Curing & Ventilation:

Curing procedures should be strictly adhered to. It is important that the surface of the coating is protected from strong sunlight and drying winds, use either a suitable curing compound or polythene sheeting, for a minimum of 48 hours, if necessary.

Overcoating & Finishing:

HydraFlex is suitable for overcoating once a certain level of curing has been achieved.

Plastering should take place using Renovation Plaster, at least 48-72 hours after the final coat of HydraFlex has been applied.

If HydraFlex has been applied as part of a DPC, breathable paint must be used on top of any finish.

If redecoration is to occur 12 months after the DPC installation, non-breathable finishes may be considered. However, the moisture content of the plaster and background must be in line with the recommendations of the supplier of the chosen finish.

Note: HydraFlex must not be punctured by wall fixings, e.g. dry lining work etc.

Data Sheets

Technical Data Sheet

Safety Data Sheet

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£79.50 £67.50 ex. VAT | £95.40 £81.00 inc. VAT

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