Use of Sealants
At Northern Pressure Cleaning Services we believe that once you have had your drive or patio cleaned you should consider the application of a sealant which will enhance the look of your property and protect the surface you have had cleaned.

There are many reasons why you should have your newly cleaned area sealed, below are just a few
  • In the case of block paving the sealant will stabilise the jointing sand
  • protects the paving from future stains
  • Inhibits the growth of weeds, grass, algae & lichen.
  • Helps to prevent the colonisation of ants nests
  • Saves time, effort and money on future cleaning of the area
  • Totally enhances the exterior of your property.

The most commonly used sealants in the UK are acrylics and urethanes. Northern pressure cleaning Services can offer both these types of sealant. The acrylic sealant comes in a basic matt and the urethane sealant comes in either matt or gloss. We will be happy to discuss the benefits and finishes of both these products and how they can enhance your properties full potential.

How the sealants work

Sealant comparison


Acrylic sealants
The acrylic sealant is the low cost option and is a two-coat process using a solution of an acrylic polymer in xylene. The polymer solution soaks into the jointing sand and the blocks, then after solvent evaporation it is left firmly bonded and coated. This has a stabilising effect on the driveway, preventing loss of the actual jointing sand and inhibiting the growth of weeds and grass in the joints. This sealing process also helps to prevent the colonisation of ant nests. The matt-look finish given to the surface enhances the appearance of the driveway considerably and has a life expectancy of 1 to 3 years dependent on local conditions. This product is a single coat application. This sealant bonds the jointing sand strongly and seals the overall surface. After some time the surface coating is lost returning the paving blocks to their original colour. The block paving is nevertheless sealed, because the blocks have been impregnated and the sand is bonded.

Urethane sealants
The more expensive pre-polymer urethane sealants perform a similar function to the acrylic option, but they are more durable and last typically twice as long between full treatments. As with the acrylic coating process the pre-polymer urethane soaks into the jointing sand, to bind the particles and sides of the blocks, or paving stones together. Then after this penetration actual polymerisation of the urethane takes place in-situ as a result of solvent evaporation, atmospheric and residual moisture. The urethane plastic is therefore effectively cured in place producing a very strong stable bond, which retains the normal flexural properties of the pavement. Once sealed with the urethane treatment, the coated driveway will withstand washing with a normal jet washer. The gloss version of the urethane polymer is a two-coat process and is therefore more expensive since it uses more material. The properties are similar, except that the surface of the blocks remains coated and are normally somewhat darker than the original colour. The two-coat process means that it can only be applied in a period of good weather to ensure a consistent finish. In addition to the gloss version there is also a matt option, which is also a two-coat process. The price for the matt option is the same as the gloss version and is chosen by customers who like the blocks coated, but with a matt appearance.