** Please note our injectors are only for the KB collection sand art. There are different producers of sand art and our injectors are specifically for our KB collection sand art only. If you use our injectors on other producers sand art, you could damage it. We recommend you to contact that producer directly. ** Thank you for your previous purchase of our KB collection sand art. You will need to regulate the amount of air in your sand picture. If there is too much air, the sand won’t be able to fall through the bubbles. Furthermore, if there is not enough air in the sand picture, the sand will fall freely and won’t create the amazing 3-D landscapes. The key point will be to adjust the air in your sand picture so that there is approximately 1/8” of an inch of air bubbles that extends all the way across to create the air barrier. Thanks for taking care of your KB collection sand art.