Waterproof underlay

Our waterproof underlay is a resin-sealing non-circulatory and collectible, resin-based liquid in the aqueous phase of a green color and load granular that forms after drying an adherent membrane, flexible, waterproof and resistant to cracking.

Ideal in new or in renovation for the realization of a tight seal before recovery.

More details

53.76€ tax incl.

In stock Order shipped within 1 to 3 days
  • 5 kg


Harmony waterproof under-sealer is a waterproof primer made of resin and granules.

Due to its nature this primer forms, after drying, an adhesive, flexible, waterproof and crack-resistant membrane.

Harmony waterproof under-sealer 'is particularly suitable in bathrooms, for Italian showers, terraces, balconies and gardens.

The product can be applied to many common building materials such as bricks, gypsum boards, plasterboard –hydrugated or not, wood pnales, agglomerated wood, stone, concrete, etc.


Type: Resin granules mixture

Colours: light green

Packaging: 5kg

Dosage: 1kg = 2m2 (in two layers).

Storage: 12 months in unopened original packaging, stored in a dry and frost-free location.

Guarantee: Manufacturer’s liability

Tools & Cleaning

Paint roller, brush, gloves, protection goggles.

Clean tools in water after use.


The base surface must be resistant, sound, solid, clean, dry and free of humidity.

If the subsurface has been relocated, you must wait at least 28 days before you can work on it.


Apply Harmony waterproof under-sealer in 2 coats with the brush, or the paint roller.

Dosage per coat: 250g / m2.

Drying time between layers: 30 - 90 minutes.

Subsequently, this waterproof resin primer can be covered with concrete, tiles, any kind of stone-floors, cement screed, felt, gravel, etc.

For angles and corners, use the Harmony Angle Kit, which consists of a silver and epoxy resin.

We recommend to apply the silver already between the first and the second layer of the waterproof resin primer.

Capacity5 kg
CompliantNF P 74-201-1
Conservation12 months in its unopened packaging and stored in a dry, frost-free place
WarrantyRC manufacturer


We guarantee a secure payment by



  • Shipped within 48 hours After reception of payment. . Period for carriage between 2 and 4 days
  • Delivery to the following countries
    France, Belgium, Luxembourg, Germany, Austria, Poland.
  • For Corsica, the DOM/TOM and other destinations in Europe, please contact us so that we can assess the shipping costs

Customer Service

You can contact us

  • via chat : at the bottom right
  • via telephone : 04 42 20 10 09
    from Monday to Friday from 8:00 a.m. to 8:00 p.m. and Saturday from 8:00 a.m. to 6:00 p.m.
  • via email : At the following address contact@harmony-beton.com

Our services dedicated to professionals

  • Harmony Béton assists professionals with every construction / renovation project involving decorative concrete.
  • You will be guided in your product choice then in its utilisation
  • You can also follow our tutorial videos .
  • We offer wholesale purchase on pallets and can ship our products in white label or with the label of your company.
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  • For further information on the nature of the review controls, as well as the possibility of contacting the author of the review please consult our CGU.
  • No inducements have been provided for these reviews
  • Reviews are published and kept for a period of five years
  • Reviews can not be modified: If a customer wishes to modify their review then they can do so by contacting Verified Reviews directly to remove the existing review and publish an amended one
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5 /5

Based on 6 customer reviews

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Océane P. published the 28/11/2023 following an order made on 15/11/2023


Produit très simple d’utilisation eh fiche technique plus que claire

Anthony F. published the 11/11/2023 following an order made on 18/10/2023


S’applique facilement

Anonymous customer published the 10/03/2022 following an order made on 17/02/2022


Facile à mettre en oeuvre et efficace

Anonymous customer published the 10/12/2018 following an order made on 21/11/2018


facile à poser. sa couleur verte permet de bien voir s'il y a des manques. séchage rapide. pas d'odeur

Anonymous customer published the 14/11/2018 following an order made on 12/11/2018


conforme à mes attentes. facile d'application. produit de qualité

Anonymous customer published the 03/10/2018 following an order made on 25/09/2018


très bon produit. Conforme à mes attentes

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