Non-hardening caulk/sealant used on doors

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Moderator Post (s) for this thread: > Caulks by Billhart on 10/14/2007 > Vulkem by Billhart on 10/15/2007

I bought a used french door and disassembled it for refinishing. The caulk used on the stationary door was a clear non-hardening gummy product. I would like to reassemble door using the same but not sure what it is. Didn't appear to be the typical silicone or urethane as it was gummy.
Thanks for help