I use tissue; make small bags; fill with fine sand (HO railroad ballast), and then ties them off with rigging thread. Once I make up the number I need, I grab them with tweezers, dip them in a 50/50 White Glue and Water solution and lay them on the model or base. I will occasionally rip a bag and let the sand spill out. Once dried, I paint, weather and dry-brush.



Hope it makes sense.
John