I have a project for which I need to mount several small, fairly smooth rocks on the surface of the mat, beneath a photo in a window opening. Can't have any physical/mechanical elements showing. Conservation of the rocks is not an issue, but I don't want to use (wince) silicone, bec. of offgassing affecting the photo. I'm wondering if acrylic gel medium would work as an adhesive? Or maybe hot glue? The rocks are about the size of walnuts.
Thanks.
Rick
Thanks.
