Unilock pavers require very little maintenance if they are installed properly. Unilock paving stones, manufactured since 1972, are made to be two times stronger than normal poured concrete. About every five years, seal your pavers to enhance the color and protect the stone from oil, stains and dirt.
Sweep the paving stones to remove dirt or debris. Remove moss from between stones. If the stone is very dirty, a power washer may be used to clean soiled areas. For oil stains, use Unilock Unicare Oil and Dirt Remover.
For sunken stones, pry them out and add sand, then replace the block. Keep adding sand until the block is even with the surrounding stones. If roots growing beneath the stone are pushing them up, use a mallet to pound the roots further into the soil.
Add jointing sand in between the stones in areas where it appears sand has been lost. Polymeric jointing sand should be used on sloped surfaces to help bind the stones. The sand also retards weed growth. Sweep the sand into the crevices. Sprinkle the patio lightly with water after applying sand.
The amount of sealer needed depends on the brand of sealer chosen. After the stone has dried, pour the concrete sealer into a spray applicator bucket available at home improvement and hardware stores. Spray the sealer liberally onto your patio, as thick as if you were pouring maple syrup onto pancakes.
The sealer takes about four hours to dry. The sealer will help prevent the growth of mold and mildew. Discard the spray applicator. You cannot use it again.