18 Mar, 2018

Use of Paving Sealers


Once you have had your paved surfaces professionally deep cleaned by us, it is worthwhile considering having the cleaned areas treated with a sealant. The reasons for choosing to have the paved areas sealed are summarised as follows:

  • Strengthens & maintains paving performance, as the sand is bonded by the sealant.
  • Reduces surface porosity thereby resisting the penetration of stains
  • greatly nhibits the growth of weeds, grass, algae & lichen.
  • Helps to prevent the colonisation of ants nests
  • Renders the area easier for future maintenance
  • Enhances the appearance, especially older paving blocks.


We are able to offer customers a choice of different types of sealers these are either a basic matt acrylic finish, or a more durable longer lasting pre-polymer urethane sealant, in either matt, or soft sheen finish


A comparison of block paving before and after sealing is shown in the picture above. There are a variety of sealants available and we will recommend the most suitable for your paving, which is chosen on the basis of economy and the wear characteristics needed in the expected use of the surface being treated.

The examples which follow show typical applications of the sealants we have used to satisfy customers requirements.

1. Acrylic sealants

he solvent based acrylic sealer  shown in the picture to the left is the lower cost option and is a two-coat process using a solution of an acrylic polymer in xylene. The polymer solution soaks deep into the jointing sand and the sides of 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 of the driveway considerably and has a life expectancy of 1 to 3 years dependent on local conditions and usage.

2. Pre-polymer urethane sealants

Pre-polymer urethane sealants perform a similar function to the acrylic option, but they are stronger and last typically twice as long between treatments. As with the acrylic process the pre-polymer urethane soaks deep into the jointing sand, to bind the particles of sand together and to the sides of the blocks, or paving stones. Then after this application actual polymerisation of the urethane takes place in-situ as a result of solvent evaporation, atmospheric and residual moisture. The urethane resin is therefore effectively cured in place producing a very strong stable bond, which retains the normal flexural qualitys of the paving. Once sealed with the urethane treatment, the coated driveway will be easier to maintain in the future using a normal jet washer.Seal a Block Domestic Premuim

In the image to the left this highlights Seal a Block Domestic Premium Pre-polymer Urethane sealer giving of a matt finish. The blocks are known as tegula blocks that have wider joints and therefore more sand is required Seal a Block Domestic Premium is an exceptional sand stabiliser and so is ideally suited to these types of blocks.

3. Seal a Block Commercial

The Seal a Block Commercial product is a single coat application sealer an example is shown in the picture to the right. This sealant binds the jointing sand firmly and seals the surface. After a peroid of time the matt finish given of fades away returning the blocks to their original colour. The block paving is nevertheless coated, because the blocks have been impregnated and the sand is bonded.

This option is chosen by clients who prefer the orginal shade of their blocks