I'd like to do a backwall of rock and have seen some info on youtube  & other sites about using black pondfoam, eggcrate, cables ties & 2 part epoxy from a hobby shop.    I have a 10 lb. bucket of Emaco from Marco rocks but I don't think it'll go very for when used for a wall.
Has anyone tried a rockwall like this and if so what materials did you use and how did it work?
	
				
			Has anyone tried a rockwall like this and if so what materials did you use and how did it work?

				