Watco New Concrete Primer


Primes and seals newly laid concrete for early painting. Suitable for areas subject to heavy traffic.

  • Withstands 98% relative humidity
  • Saves waiting for new concrete to dry out
  • Can be applied to damp surfaces
  • Overcoat in just 16 hours
  • Can be used with underfloor heating systems

Note: While great care is taken with the colour samples shown, no guarantee can be given that they represent exactly the colours offered.

£173.34(ex. VAT)
£208.01 (inc. VAT)
Please choose your colour
Available for Delivery (See Delivery Options Below)


Watco New Concrete Primer is a two pack, virtually solvent free, epoxy resin liquid damp-proofer. This one coat application suppresses residual moisture in new concrete, allowing the floor to be coated and put into use quickly without waiting for the concrete to dry out.

Most coatings cannot normally be applied until the new concrete moisture content has reduced to less than 75% RH (relative humidity), which can take several weeks or months depending on the depth of the concrete.

New Concrete Primer will tolerate up to 98% RH.

Watco New Concrete Primer can be overcoated with most types of floor paint after approximately 16 hours. The special formulation encourages penetration and good adhesion, and the flow control agents help resist air pinholes forming, essential in a damp proofing coating.

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Features & Benefits

  • For newly laid concrete, sand & cement screed, and suitable for areas subject to heavy traffic
  • Suppresses construction moisture which enables newly laid concrete floors to be painted and put into use quickly
  • Virtually solvent free, epoxy resin liquid moisture barrier
  • Withstands up to 98% RH (relative humidity)
  • Ready for over coating in 16 hours
  • Suitable for heavy wear areas
  • Flexible
  • Can be used with underfloor heating systems

Surface Preparation

Concrete & sand and cement screed – should be sound, clean and free of any contaminants liable to prevent penetration into the substrate or adhesion to the surface. Machine scarifying or shot blasting are ideal ways to clean and prepare large areas of concrete and remove contaminants. Use a vacuum to remove all surface dust.

Very smooth or power floated concrete – should be shot blasted to provide a good key for the New Concrete Primer to bond to. Use a vacuum to remove all surface dust.

Underfloor heating systems – should be switched off at least two days prior to the application of New Concrete Primer and left for a minimum of two days before switching back on. Once switched on, the underfloor heating should gradually be turned up a few degrees at a time.


The product comprises a resin and curing agent packed in a plastic container. Remove the lid from the container and remove the ‘top chamber’ which contains the curing agent. Tip the contents of the top chamber into the container, mixing with the resin.

Mix thoroughly using a wide bladed tool – a piece of batten is ideal. Scrape around the sides and bottom of the container to ensure the product is well mixed. This is fine for a small number of units. If you have multiple packs to mix we recommend a paint stirrer in a slow speed electric drill.


Important – once the contents of the pack have been mixed, a chemical reaction takes place which creates heat, and the product should therefore be decanted into a roller tray and used immediately.

Best results are obtained in warm (minimum of 15°C), dry conditions with good ventilation. Apply with a medium pile roller, (not foam), working well in the surface of the concrete. One thick (250 microns) coat is usually sufficient. The coating should cover the substrate leaving no pin holes or missed patches. Most reasonable quality new concrete will cover successfully with one coat. Inspect the surface once the first coat has dried. Apply a second coat to cover any patches which may have been missed or where trapped air has caused pinholes. The product contains special wetting agents which help prevent air bubbles forming on most concrete surfaces.

Repairs/Resurfacing – If the intention is to apply a floor screed or resurfacer, such as Watco Flowtop, or Concrex to the New Concrete Primer, then 2 coats are required. Please blind the second coat with dry sand to provide a key for the overlay material.

Standard Compliance

  • BREEAM Compliant
  • Very low VOC level (10g/litre)
  • ISO 16000
  • REACH Compliant


If the surface to be primed is very porous or open textured, trapped surface air may cause pinholes. The first coat should be inspected on such surfaces and a second coat applied in any patches where pinhole air holes exist.

Do not exceed the coverage stated – mark out an area of 25m2 per pack to avoid applying it too thinly.

Once mixed, use immediately, and finish within 1 hour. Do not part mix. Only mix enough packs that can be used within the working life.

Product Details

Data sheet

For Use By
Professional Use
Interior / Exterior Use
For Use On
Concrete Floors
For Use On
Application Method
Medium pile roller. Cut in using a brush.
Pack Size
8kg (5.75L)
Minimum Applied Thickness
250 microns
20-25m2 per 8kg at 250 microns
Recommended Thinner/Cleaner
It is not practical to clean the roller sleeves and they should be discarded after use.
Min. Application Temperature
Air temperature 15°c, floor temperature 10°c
Min. Application Temperature
Air Temperature 15°C.
Floor Temperature 10°C.
Touch Dry
10°C: 7-10 hours
15°C: 4 - 6 hours
20°C: 3 - 4 hours
Recommended Dry Film Thickness
250 microns
Recommended Wet Film Thickness
250 microns
UN Number
UN3066 (Clear Curing Agent)
UN3082 (Grey Resin)
UN Number (Activator)
UN Number (Base)
Pot Life
1 hour at 15°C
Dry to Recoat
Allow 16 hours at 15°C before applying any Watco 100% solids coating
Allow 24-48 hours before applying water based products
If more than 4-5 days have elapsed before overcoating, New Concrete Primer should be lightly abraded to provide a key
Base Type
Exterior / Interior Use
Interior Use
Suitable For Use On
Factory Floors
Suitable For Use On
Concrete Floors
Suitable For Use On
Warehouse Floors
Suitable For Use On
Workshop Floor
Suitable For Use On
Suitable For Use On
Sand and cement
Application Method
Product Type
Damp Proof
Product Type
Product Type
Product Type
Colour Family

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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Watco New Concrete Primer is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

All delivery costs below are excluding VAT

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