Paver sand and sealing is very important to your brick pavers. Without having joint stabilization sand in the joints of your brick pavers, rain or pool water will run between the joints. Which will result in the base aggregate sand material your brick pavers float on to wash out. When that happens your brick pavers will become loose, wobbly, uneven, cracked, sunken in or even raises up in some areas. Sealing brick pavers helps hold the joint sand in place. Sealing pavers can help preserve their lifespan by enhancing their color and texture. Also helps providing weed and moss resistance. Sealing also repels dirty and stains. Concrete pavers are very porous and will absorb stains in not sealed.