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I have just this year started using A product by Sure-Bond that seals the joints and the pavers. The look on the pavers is about the same as a paver sealer with the added benefit of sealing the joints to defeat the weeds and ants. It is faster and cheaper than poly sand and there is more room for error (polysand adhering to top of pavers and the employee who sprayed 1000 sq before it was compacted ). You just don't want to overspray or the pavers become slippery, but they claim you can throw silica sand if you are doing two coats to make the pavers really sparkle. It been working great except for the job I did that the owners didn't tell the cleaning crew not to spray down for 24 hours and they blasted all the joints with hot water.
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