This is how I created a custom terrarium background. Lay the enclosure down on it’s back. Add GE1 silicone to create texture for the foam to adhere to. Wait for the silicone to dry before foaming. Vigorously shake the can of Great Stuff Pond and Stone foam. Add foam to the entire background. Lay down corkbark and finish foaming. While the foam is still wet and expanding sprinkle down dried spagnum moss followed by dried coco fiber. After adding a thick layer use a glove and gently tap the fiber