This is some seriously cool tape:http://www.uline.com/Product/ProductDetail.aspx?model=S-11847It's made of silicone, adhesive free, sticks only to itself (weakly at first), and after 24 hours it's permanently bonded. It's also heat resistant to 500 F!What are you using it for?
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JB Weld is good to around 600F.
Miracle Seal Epoxy is what i use. good for over 1000F.