You want even the sides of the joints dry if possible so no moisture inhibits the dry polymeric sand from flowing to the bottom of each joint. The top surface of the pavers needs to be clean.

When the polymers dry and cure the sand between the joints gets quite hard and it cements the pavers together. Weeds won’t grow between the joints and the sand doesn’t wash away.

You want even the sides of the joints dry if possible so no moisture inhibits the dry polymeric sand from flowing to the bottom of each joint. The top surface of the pavers needs to be clean.

When the polymers dry and cure the sand between the joints gets quite hard and it cements the pavers together. Weeds won’t grow between the joints and the sand doesn’t wash away.

You want even the sides of the joints dry if possible so no moisture inhibits the dry polymeric sand from flowing to the bottom of each joint. The top surface of the pavers needs to be clean.

When laying pavers with polymeric sand, use a hose nozzle that produces a gentle shower. Move it back and forth and just put a light amount of water on the pavers. (Tim Carter) ...

Because the joints are so close together, the sand can get trapped at the very top of the paver joint and not get all the way to the very bottom.

When not secured with mortar, patio pavers must be set in a sand base over a gravel subbase. Sand provides a solid base for the pavers, and the gravel ensures good drainage. Sand-set (sometimes ...

Paver sealer also retards joint sand erosion by creating a weather barrier. Some paver sealers can provide a glossy sheen or "wet" look which many homeowners like.

This material is composed of fine granules of sand and polymeric adhesives. When exposed to water, this material hardens into a nearly invisible substance below the paver joint line.