I'm wondering if anyone has tried mixing their own Pliacre* substitute. The reason I ask is that in the project I'm currently working on, it would be useful to have a clear-ish epoxy putty to cast a shim out of. Has anyone ever tried bulking a clear epoxy with fumed silica or another material that lead to a stiff final product that can be molded like a regular epoxy putty? If so, I'd love to know what you tried and what results were like.

Thanks,
Jamie Hascall
Chief Preparator,
Museums od New Mexico Exhibits
Santa Fe

*For those recently to the mountmaking field, Pliacre was the standard epoxy putty used for forming supports for objects. It Became Phillyseal R before being discontinued three years ago by Philadelphia Resins.