There are probably some Vulkem (https://www.tremcosealants.com/) products that will work. Identifying them may be a bit of a pain. Companies like Tremco are generally reluctant to recommend one of their products for a 'mission-critical' application in a market that is not important to them. They look at it as a low-profit, high-risk market and often adopt a use-at-your-own-risk stance.
This product will probably work:
http://www.kelleytech.com/olympic/ol...view.asp?ID=29
I looked on Amazon, but the price there is double what you should pay, so use Google for a better option.
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