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Use up until freezing and your fine.
Just sweeping and no compaction will be fine if you are not concerned about filling the joints. When you fill and then compact, the sand settles and it enables you to fill the whole joint. If you just sweep and water, then you may have some settling of the poly sand down the road.
"Compacting small areas", we use some protection over the area (carpet, wood, tamper pad, etc.., and use a hand tamper.
As far as compacting screedings, "different strokes, for different folks". I know many people that lay right on fine graded modified, I know guys that compact dust, I know guys that lay on clean stone, and our company lays on screeded concrete sand. Many of the guys that I am refering too, do great work. Its all about your comfort zone and what gives YOU the best results. The only thing that I feel that may open non conventional methods up to criticism would be if something fails and Non Industry approved methods were used. Then it becomes a question of who is right and who is wrong. JMO
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Matt
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