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Watco Concrete Sealer Water Based

Unique dustproofer, hardener and surface sealer combined

  • Microporous formula allows surface to breathe
  • Reduces staining and is easy to clean
  • Suitable for general industrial use
  • Dustproofs and seals one

Frequently bought together


Watco Concrete Sealer Water Based seals and hardens new and old bare, porous concrete floors and screeds. It is micro-porous which allows the surface to breathe.

Watco Concrete Sealer Water Based contains a micronised acrylic which penetrates deep into porous surfaces to bind, harden and seal. The cross linking properties of the acrylic dries to form a surface film, providing a more stain resistant, easier to clean finish. The appearance can vary from low sheen to gloss depending upon the porosity of the substrate and the number of coats applied. It is quick and easy to apply and most suited for use in warehouses and production areas, or anywhere which would benefit from a penetrative, dustproof, virtually odourless sealer for medium trafficked areas.

Concrete Sealer Water Based is also available in a light grey finish, which both seals and tints the floor at the same time. Concrete Sealer Water Based is breathable, virtually solvent free and safe for use in confined areas. It has an A+ VOC emissions rating with a very low VOC content.

Recommended areas of use

  • Warehouses
  • Production Areas
  • Garages
  • Storage rooms


  • Clear, acrylic, water based sealer
  • Also available in a light grey tinted version to both seal and add colour
  • Penetrates, dustproofs and hardens in just one coat
  • Single pack sealer – easy to apply
  • Ready for full use after 24 hours
  • Only one coat is generally needed saving on downtime
  • Minimal darkening effect on most surfaces
  • Breathable
  • Virtually solvent free and low odour
  • Glossy finish – stain resistant and easy to keep clean


Curing TimesRecoat TimeTouch DryLight TrafficFull Use 
10°C8 hours6 hours12 hours24 hours  
20°C6 hours4 hours12 hours24 hours 
30°C6 hours2 hour12 hours24 hours 
Light Traffic: Foot, trolley, pallet truck, occasional forklift
Full use: Regular forklift, heavy footfall, parked vehicles
Suitable for Bare, porous concrete and sand and cement.
Finish Clear or light grey tint, glossy.
Interior or Exterior Interior and exterior.
Primer required To seal a particularly porous surface, or to achieve an even light grey tint, additional coat(s) may be required.
Composition Water based acrylic.
Number of components 1
Coverage 40-50m² per 5L depending on the porosity of the substrate. Textured or particularly porous surfaces, such as sand and cement screed, will greatly reduce the coverage.
Number of coats Usually 1 (see above).
Wet film thickness 100 microns.
Dry film thickness 50 microns.
Minimum application temperature Air temperature 15°C, floor temperature 10°C.
Shelf life 12 months in unopened containers.
Cleaning tools Warm soapy water.

Surface preparation

Bare concrete – a good sweep and/or vacuum is often sufficient on a dusty surface. For the removal of dirt, light oil and grease we recommend Watco Bio-D. Flush with clean water and allow the surface to dry. For heavier deposits, Watco Concroff, a very powerful degreaser, is recommended, again, flush with clean water and allow the surface to dry. Concrete Sealer Water Based must be applied to a dry surface, not wet, however, if any residual damp remains as a result of cleaning, this is acceptable. Avoid wetting very porous surfaces since they will absorb too much water.

New concrete – as a guide, new concrete should be left for 4 weeks to dry in the summer and six in the winter. Surface laitance should be removed by means of mechanical abrasion. If the surface is dirty, please clean as per the heading ‘Bare concrete’.

Priming – is not usually required, but for open textured, or very porous high suction surfaces, such as sand and cement, further coats may be required to seal the substrate and to provide a uniform finish. Do not use on very smooth or power floated concrete, instead use Watco Powerfloat Sealer.


Important – give the container a really good shake to disperse the pigment which may have settled during storage. Pour a small amount of Concrete Sealer Water Based directly onto the floor and spread using a soft broom or brush, working it into the floor. It is important to spread it reasonably evenly to avoid an uneven finish. If a stronger colour is required when using the tinted grey version, apply a second coat.


Material Safety Data Sheets are available.

£62.40 (Ex VAT)

In stock

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Tools and accessories

Stiff and Soft 12" Brooms

Stiff and Soft 12" Brooms

For cleaning or applying Watco universal sealer dustproofer

From £10.50  (Ex VAT)

Paint Brush

Paint Brush

Professional paint brushes suitable for all coatings

From £2.20  (Ex VAT)

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Help & Advice

Contact our friendly and professional Technical Advisors for expert help and advice for your project. You can give us a call on 01483 418 418 or email

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