My scape is held together with fine oolite sand and thin, quickset super glue. Messy, comes out like water but sets in seconds. It was a little more money but something you need to consider is the time it takes for the pieces to set. It set very fast and I tested a couple pieces glueing them together, building up a joint with multiple layers, then smacking them on the ground. They usually break at the rock and not the joint.