Answers › Planning to create an outdoor layout? What do you recommend for adhesives for glue down the ballast. While I am asking, exterior scenery materials as well? 0 Vote Up Vote Down Carl Sorensen asked 2 months ago 1 Answers 0 Vote Up Vote Down admin Staff answered 2 months ago I would not glue it down at all. If you have to use Gorilla Heavy Duty Spray Adhesive.