Re-attaching under tank heater?

Any ideas on how to make the sticky side adhesive again?
Yes I moved it from a smaller tank.
Would contact cement or gorilla glue work?
Want it to be fire safe too...

Get some foil tape and use it first to cover the sticky side, then to attach it to the tank. You can now reuse and move that UTH as much as you want.

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X2 what CryHavoc17 said. Foil Tape is what you're looking for.

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To be clear, CryHavoc17's talking about sticky side of tape to previously sticky side of heater. Then you can use that same foil tape to secure it to the bottom of your tank again. :)

Foil tape.
I keep several rolls on had at al times.

like everyone else says, foil tape is amazing to have around