I use (and am in the middle of ballasting a lot of track surface) iso alcohol 50/50 with water. Then a 2/3 to 1/3 water/white glue mix. I use small squeeze bottles for both. By the next day, the ballast is totally solid and dry. Works like a charm and is inexpensive. Gallon of Elmer's shouldn't be more than $13-14 online. Iso alcohol (70%) is of course, available at any drugstore or Costco, etc.
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