Oogoo (Sugru Substitute).... it's fun so I thought I would post it. You may need to experiment a little to get what you want. Also a great way to make cheap mold for casting resin or for clay. How-To: DIY Make cheap castable silicone from caulk
Sugru sticks permanently to lots of stuff like ceramics, glass, metal, wood, and most plastics and fabrics. That's exciting because it makes it very versatile, but also you can also use Sugru to bond unusual combinations of materials together.