Sand stabilizes the pavers and prevents their movement, but pressure washing pavers causes the removal of the fine sand from in between the paver joints. To ensure stability, resanding, which is the process of placing new, clean sand back in the joints to replace the previously displaced sand, is required. Currently, resanding can be done with two types of sand: traditional or polymeric. Typically, traditional sand produces the best results.
No matter what type of sand is used, your paver structure is moving (settling, edge problems, etc.). There is NO sand, locking agent, or sealer which will last forever or not crack over time.