Using a foam brush, apply the glue and water mixture to part of the balloon and each side of the faux leaf. Press the leaf onto the balloon (curved conforming to the balloon). The leaf may not stick to the balloon perfectly or evenly, but that’s okay. If any leaf corners are sticking up significantly, hold them down for 30 seconds with your fingers until the glue dries a bit. I learned it helps to be patient and not worry about it being perfect.