How to seal concrete pavers Make sure that the surface is dry and that it doesn't rain for at least the next 24 hours. Clean the surface of the paving stone to remove dirt and stains. Remove any weeds that grow between the pavers, apply the sealant with a low-pressure sprayer, covering the entire surface of the patio or driveway, etc. The biggest drawback of rolling the sealant onto brick pavers is that the roller can pick up sand from the joint and roll it over the surface of the brick pavers.
Most pavers manufacturers will tell you that there is no need to seal pavers, however, it is highly recommended. Sealing can also protect pavers from anything foreign that may fall on them: oil stains, leaves, or spills. As for giving the best wet-looking glossy finish, I would recommend a 2-part water-based polyurethane to seal pavers. That said, another major cause of pavers moving is the lack of sand in the paver joint.
The seal creates an invisible layer on top of the pavers that repels water, oil and anything else you might accidentally drop, as long as you wash them as soon as you notice it.