Eternabond tape

I have a strip of Eternabond I've been carrying around for at least 4 years now. I recently cut off a small piece to patch a sprayer tank and it seemed to work just fine, but it made me wonder. Does this stuff have a shelf life?

I looked at the product specs on the Eternabond web site. Not all products have a shelf life listed, but for those that do, they state "up to 5 years".