Heavy Duty Block Paving Sealer

Heavy Duty Block Paving Sealer is a clear, polyurethane resin, designed to penetrate the jointing sand of block paving to form an elastomeric joint. Suitable for commercial paving, such as high streets, road and runways.

Stock Code:23N850NF1005

Why Choose Heavy Duty Block Paving Sealer?


  • Extremely heavy duty formula - our low viscosity polyurethane resin is designed to penetrate the jointing sand of block paving to form an elastomeric joint, minimising the growth of moss and weeds between paving slabs.
  • In addition to stabilising joints, our Heavy Duty Block Paving Sealer protects the paving whilst enhancing its appearance and creating an easier substrate to clean and keep free from oil, fuels and stains.
  • Suitable for - commercial, public or industrial premises with heavy to extremely heavy traffic.
  • UV light resistant, and weather resistant - unaffected by ice, water and most common chemicals.
  • Quick to apply - cures and seals concrete block paving in one application.
  • Dries to a sheen finish.

Block Paving Sealer Frequently Asked Questions

Q. Why should I choose this product when there are cheaper alternatives on the market?
A. Our block paving sealer is a professional standard product. It is superior in quality over the vast majority of domestic alternatives. Our customers are extremely satisfied with the results they have had with our block paving sealer, and you can find excellent reviews of this product on our TrustPilot page.

Q. If there is a break in applying, does it dry to a different shade being applied at different times? Can you see the break?
A. If the application is interrupted there may be a risk of a slight difference in colour. A single continuous application is always preferable.

Q. Does the product affect any slip properties of the substrate, e.g tiles with a rough surface?
A. The sealer penetrates the surface leaving only a minimal coating on the surface, so therefore the slip potential should not be greatly affected.

Q. If applied using a hand pump, will the product damage the O Rings?
A. The material is solvent borne, therefore if the equipment is not solvent resistant then yes this will damage the seals.

Q. If someone reuses a container that has previously had weed killer in then thoroughly cleaned and dried it, would there be a reaction if they then put the block paving sealer in?
A. If the material comes into contact with any water or moisture then there could be a reaction producing a detrimental effect upon the applied material.

Q. Is the block paving sealer polyurethane or acrylic based?
A. The sealer is PU Polyurethane based.

Q. Will the sealer whiten with moisture either from above or below?
A. If the application instructions are followed thoroughly, there should be no whitening. This will be at risk of occurring only when material is either put on a damp surface or it rains before the material has dried.

Q. Does this product react with rollers and plastic trays used to apply it?
A. Rollers and plastic trays should be fine as they are usually made of materials with some solvent resistance.

Q. Can the sealer be decanted into a smaller vessel? Will an ordinary plastic syphon cope with the decanting or will it dissolve?
A. The syphon and new vessel would have to be made of solvent resistant material. Another option could be to use a funnel made of metal or solvent resistant material, and decant that way. Any decanting should always be performed in a well ventilated area.

Q. Can it be applied to a natural stone patio?
A. The Heavy Duty Paving Sealer is a PU based resin which is suitable for any concrete/stone surfaces.

Q. My driveway is concrete with an imprinted block paving pattern imprinted in it. Is this still ok to use on this substrate?
A. Although it should be fine, we always recommend patch testing first to be on the safe side.

Q. Does the sealer allow water to drain/penetrate?
A. Once treated, the paving will resist water ingress but the resin is permeable to water vapour so some "breathing" of the paving will occur, however this is not a notable feature of this material.

Q. How long before it needs reapplying?
A. The lifetime of the coating would be expected to exceed 2 years, however the exact lifetime will be dependant upon the amount of wear/trafficking and the porosity of the substrate.

How to Apply

  • Heavy Duty Block Paving Sealer is applied using either a fine rose watering can or a low-pressure horticultural type sprayer. Our Block Paving Squeegee is also recommended. We would recommend using a soft brush or roller if spraying is not desirable.


Preparation - New Installations

  • Blocks should be visibly dry in appearance. Do not apply when rain is expected. The jointing sand should also be dry although a small amount of dampness can be tolerated. The jointing sand should be well compacted and slightly below the pavement level as to avoid sand being plucked out and deposited on the surface.


Preparation - Existing Installations

  • Paving should be cleaned by water blasting, grit blasting or steam cleaning. The surface should then be allowed to dry before re-sanding and compacting the joints. It is preferable that, before sealing, the jointing sand is also dry. Do not apply when rain is expected.



  • A liberal amount of Heavy Duty Block Paving Sealer should be applied to the surface using either a watering can with a fine hose or a low-pressure horticultural type sprayer.

  • Using our Block Paving Squeegee, push any excess sealer off the top of the paving and into the joints.

  • Attention should be paid to ensure sufficient material penetrates the joint to achieve stabilisation without leaving an excess of Heavy Duty Block Paving Sealer on the surface of the block.

  • On paving of a rigid construction, we would recommend an application using a soft brush or roller if spraying is not desirable.

  • Drying time at 20°C: 2 hours.

  • Empty tins can be disposed of in builders' skips. If any material remains in the tin, it should be treated as chemical waste in accordance with section 13 of the Mechanical Data Sheet (Specifications tab).

Technical Data Sheet

Mechanical Data Sheet




  • Tin Size: 5L or 20L
  • Coverage: 5L covers 15m² - 20L covers 60m²
  • Coat Amount: One coat is recommended


  • Clear

Prices shown are excluding VAT. Please note this is an all day courier delivery service and is not guaranteed. Please refer to point 6 of our terms and conditions for full details.


Order Value United Kingdom Mainland
£100 and under £9.95
£100.01 to £300 £16.00
£300.01 to £500 £25.00
£500.01 to £750 £35.00
£750.01 to £1000 £42.00
£1001.01 to £1500 £52.00
£1500.01 to £2000 £67.00
£2000.01 to £3000 £95.00
£3000.01 to £4000 £120.00
£4000.01 and over £300.00


Order Value Highlands and Islands*
£100 and under £45.00
£100.01 to £500 £100.00
£500.01 to £1000 £200.00
£1000.01 to £3000 £280.00
£3000.01 and over £300.00


Order Value Europe Zone 1 & Northern Ireland**
£100 and under £45.00
£100.01 to £3000 £150.00
£3000.01 to £6000 £250.00
£6000.01 and over Please call 01440 712722 for a bespoke quote.


* Highlands and Islands include - the Scottish Highlands and Islands, Isle of Wight, Isle of Man and the Channel Islands. ** Countries included in Europe Zone 1 - Southern Ireland, France, Germany, Luxembourg, Netherlands & Belgium. For all deliveries outside Europe Zone 1, please call 01440 712722 to place your order.