The best glue to use for setting ballast in place is one specifically designed for that purpose, such as Noch's...
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Kato AC/DC N Scale Power Supply for SX Controller
Single Track Catenary (16)
Disc Wheelsets (8) Black
Unitrack Turnout Control Switch (Black)
Unitrack (S124C) Straight Level Crossing Track 124mm
Kato SX Controller (Black)
Unitrack British Model Railway Track Plans Book
Unitrack Narrow Gauge Oval Track Set with SX Power Pack
Unitrack Track Nail
Glacier Express Seated passengers (6)
Japanese Twilight Express Dining Car Staff (6)
Straight Uncoupling track (2) - 123mm (4 7/8")
Straight Rerailer track (2) - 123mm (4 7/8") Road Crossing
Japanese Joggers (4) and dogs (2)
Disc Wheelsets (8) Silver
Japanese Maintenance Workers (6)
Japanese Standing Passenger Figures (6)
Japanese Seated passengers figure set 1 (6)
Japanese Walking Passengers Figure set 1 (6)
Japanese Walking Passengers Figure set 2 (6)
Japanese School Children figure set (6)
Japanese Teenagers (6)
Japanese Older Cyclists
Japanese Passers By (6)
Japanese Assorted farm animal set (16)
Japanese Sleeper Staff (4)
Japanese Twilight Express Staff (6)
Japanese Blue Train Dining Car Staff (6)
Japanese Sleeper Crew (6)
Japanese Female Train Crew - figure set 2 (6)
Japanese Railway Driver / Conductor - figure set 2 (6)
Japanese Railway Driver / Conductor - figure set 1 (6)
Japanese People in kimono (6)
Japanese School Children + Adult - figure set (6)
Japanese Fisherman (6)
Unitrack (V6) Outer Oval
Glacier Express Seated passengers (no legs)
Unitrack CV2 Compact Line Turnout Set
Curved Track 45 Degree, 9-3/4" 249mm Radius (x4)
Unitrack (R610-22.5) Curved Track 22.5 degree (x4)
Unitrack (S123) Straight track 123 mm (x4)
Unitrack (S246F) Straight Feder track 246mm