Now let's dive deep into the third step: Time and Spray Foam. Let the silicone you have just applied to the background cool for at least five to eight hours so it generates a stable texture that the spray foam can adhere to.

Now that it has fully cooled, place some wood, platforms, and decor on the background with your hands. Start spray foaming the areas around these platforms, holding them in place from the top. Once the platforms are stable with the newly applied spray foam, you can repeat the process in other parts, eventually covering the entire terrarium. Remember, nature does not promote perfectly balanced backgrounds, so give it depth and texture—do not just apply the spray foam in straight lines.

It is key to know exactly what you are aiming for in this step, as there will be no going back. Now let that spray foam cure for at least 28 hours. I know you want to work on it sooner, but the wait is worth it!Please note that spray foam expands approximately six times its initial volume, so do not overfill the terrarium with foam.