Originally Posted by Gilly@N&W:
Same thing I normally ballast with. 50% Woodland Scenics Cement, 25% Elmers Glue, 25% water. 100% Woodland Scenics Cement would work, but I'm too cheap to use it full strength.
Nothing against Woodland Scenics, but 50% Elmer's Glue and 50% water will work just fine, too. Just remember to spray with wet water first.