I have used aquarium silicone in the past from all glass aquarium that runs around 7 dollars a tube but GE 1 window and door. It works great and works just the same for 4-5 dollars at the local hardware store. Make sure to use the window and door version and use it in a open area with good air flow. Great for DIY backgrounds
Disclaimer: The views expressed by redzebra24 are those of his own and not necessarily the shared views of any other person, party, or affiliates.