Factory in-line sealing is an available option by request on orders over 500m². The ideal time to apply these surface treatments is at the point of manufacture.  Paving is sealed in the factory while product is clean thus avoiding on site contamination of dirt. This allows for more accurate application of the surface treatment, ensuring that the correct amount of sealer is applied to the surface. In turn this gives the treated surface all the properties of post impregnated paving. It also removes the probability of secondary efflorescence and makes the application of cement based grouts easier.