Sculpey Bake and Bond works great! It bakes to a transparent finish so it is not visible where your repair or addition is. It sticks way better than any glue I've tried. The consistency is just right too. It's just sticky enough before baking to give you time to support the pieces. I use aluminum foil to hold and support the pieces. It can be baked many times as long as you keep the temperature low so your piece doesn't burn. I wish I had had this when I first started playing with polymer clay many years ago. It is much easier to assemble large parts and use them to repair broken parts.
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