Polymeric sand or envirosand is the important part. You put it in the cracks and spray it with water.
Polymeric sand hardens and forms a seal of sorts.
Envirosand becomes gel-like when wet and sort of self-heals each time water touches it, bonding the stones together.
Polymeric sand hardens and forms a seal of sorts.
Envirosand becomes gel-like when wet and sort of self-heals each time water touches it, bonding the stones together.
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