Waterproof underlay
- Étanchéité SPEC
- Bloque les remontées d'humidité
- Adhérence optimale
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.
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Packaging
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Free delivery on polished concrete kits of 10m² or more

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Payment in 2 or 3 installments available
for metropolitan France -
Customer service available 5 days a week

to support you with your project -
Quality product made in France
Description
- Features
- Payment & Delivery
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Description
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.
Characteristics
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.
Preparation
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.
Application
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.
Payment
We ensure secure payment by

Pay in 4 installments at no extra costPay in 3 or 4 installments using your bank card (Carte Bleue, Visa, or MasterCard). This 3 or 4-installment payment option is available for any order totaling more than €100, up to a limit of €2,000. Currently, the Alma payment solution is available exclusively to customers holding a bank card issued in France. | |
Pay in 4 installments at no extra costExclusively for individuals residing in France (a French PayPal account is required). PayPal "Pay in 4" is available subject to approval for purchases between €30 and €2,000. A 14-day withdrawal period applies. |
Delivery
- Product shipped in 72h upon receipt of payment. Delivery within 2 to 5 days, depending on the size and weight of the package.
- Delivery to the following countries
France, Belgium, Luxembourg, Germany, Austria, and Poland. - For Corsica, the French overseas territories (DOM-TOM), or other destinations in Europe, please contact us so that we can provide a shipping quote. Contact us
Contact us
You can contact us
- Via chat: bottom right
- By phone: 04 42 20 10 09
Monday to Friday, 8:00 AM – 6:00 PM - By email: at contact@harmony-beton.com
Do you have everything you need for your project?
Polished concrete kits contain the essentials for carrying out your project. Depending on the surface, the room, and the intended use, certain tools or maintenance products may also be helpful to ensure you can complete the job with ease.
Tools for a clean application
If you are not already equipped, these tools facilitate application and prevent marks.
Extremely resistant polypropylene paint tray suitable for all types of water and oil-based paints, varnishes, lacquered paints and wallpaper glue. Textured background to remove excess material and spread evenly over the roll. Washable and reusable or to be covered with disposable protective films.
Ideal for quickly and easily passing primers or epoxy on large surfaces thanks to its width and the addition of a handle. Adaptable wooden handle, aluminum or plastic. Delivered without handle.
Telescopic aluminum handle. Up to 3 m unfolded. The color of the handle can vary. Telescopic boom both light and robust, suitable for painter rollers and squeegees. Can be locked to the desired length by twisting / locking action. Achieves high walls, ceilings or floors. Equipped with universal screw-in connector and tapered adapter.
This 250 mm complete roll is the perfect tool for the application of finishing layers on your decorative concretes (filler, varnish and resins...) It allows an easy application without leaving the traces of roll. Compatible with the handle 3 m alu.
Microfibre Roller Sleeve 230mm Short-pile microfibre 55mm dia roller with maximum absorbency and high paint-loading capacity. For use with water, acrylic and solvent-based paints. Reduced paint splatter and smooth finish. Inner diameter 44mm (1-3/4"). Compatible with Silverline Cage Roller Frame and Heavy Duty Roller Frame.
Includes 1 tray and 1 medium pile sleeve to apply primer and 1 foam sleeve for varnish.
Clear, disposable PVC inserts with even loading, cross-hatch pattern. Insert in roller trays or use separately. Eliminates the need to wash out the tray and prolongs service life. Allows quick swaps between paint types and colours.
Low Tack Masking Tape Low-tack crepe paper masking tape with special low-adhesion synthetic rubber adhesive designed to give a crisp, sharp line on delicate surfaces, such as freshly-painted or plastered walls, wallpaper, treated wood and emulsion paint.
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For the purchase of a concrete kit covering 10m² or more