Now I want you to wait about one or two complete days so that the spray foam can fully cure. You may then start cutting any unwanted spray foam parts so it can look even more natural. My suggestion is to use a really strong cutter, as from experience cheap ones tend to break under pressure, and the broken part can go flying off. After achieving the desired shape, apply silicone glue all over the cured spray foam, and once it is fully covered, add a generous amount of dirt, covering every desired area. I suggest that the dirt be well mixed with coconut fiber and some sphagnum moss to enhance realism. Make sure to do this while the dirt is completely dry, and also ensure that the terrarium side covered with spray foam is horizontal to the ground. Now, let’s wait for about one or two days (yes, I know it is boring, but it is necessary).