A new block paved you should not be sealed right away. The natural process of efflorescence will occur over a few weeks, where the salts in the concrete will push out, creating a white stain on the paving. This is completely normally and will fade away after a few weeks. Once the efflorence has left the paving, you can then seal the block paving. Sealing the paving will help to prolong the colour of the paving and protect it from weather damage as well. A sealed driveway after a new installation will easily last upwards of 10 years and this is why we guarantee that period.