I am finishing up a small layout for my dad who lost his layout when he went into assisted living. I will not add trees until after it is shipped up to him, however, I have added bushes made with Woodland Scenics Fine Foliage. I covered an embankment with it. I would like to glue it into a clump (like how it comes in the package) to make it more durable for the trip. I sprayed it with hairspray but I think I need something heavier. Diluted white glue? Has anyone done something like this for a portable module. Any ideas?