In case you missed it, there is a bigger, badder duct tape in town. Used mostly in the nuclear power, shipping and steel industries, this stuff can handle just about anything.
3M's Nuclear Grade Performance Plus Duct Tape is certified for low leachable halogens and sulfur and can handle temperatures up to 93-degrees Celcius. It's also UV resistant for up to one year. A 600-yard roll runs around $US15. [3M via Toolmonger via Red Ferret]