Warning: too much glue can lead to flat patches of fugly moss-looking fibers, instead of nice standing-up grass.
I generally glue down sand with watered down white glue, then when it dries put another layer of watered down white glue to really cement down the sand, and push little rocks into it.
Then put it down and leave it for a few minutes until a lot of the water has evaporated, and THEN drop little clumps of static grass down, blowing on them immediately from the side to get them to stand up.
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