Black Expanding Foam

I want to use expanding foam covered in Drylok as my background, but Great Stuff Pond & Stone is impossible to find unless you want to pay $25 a can on Amazon. Does anyone know of an alternative that is also animal safe, black, and will stick to glass?

I’ve only been able to find info on Great Stuff Pond & Stone that fits all of those criteria. Has anyone worked with Great Stuff Multipurpose Black or any other black expanding foam that they can verify is animal safe and will stick to glass?