What was the original 'failed' purpose of the adhesive that eventually became used in Post-It Notes?

The path from invention to successful product isn't always straightforward! Some of the most iconic products we use today resulted from accidents, persistence through initial failure, or revolutionary packaging innovations. The Post-It Note is a perfect example of how an 'unsuccessful' adhesive formula eventually transformed workplace communication worldwide. Test your knowledge about this famous product development story that changed how we organize information.

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It was intended to be a super-strong permanent glue for airplane construction
It was designed as a medical adhesive for wound dressings
It was developed as a waterproof sealant for outdoor applications
It was created to bond plastic components in electronic devices