I am thinking of using gumdrop-size pebbles and polymeric sand in the joints between irregular bluestone flags. The flags are dry-set. I've used polymeric sand before and also smaller pebbles on separate projects, but never the two together.

Has anyone else done this? Does it last? What technique did you use? Should I mix the two together before sweeping it and top with more sand if necessary, or should the pebbles be added first, then the sand?