What was the original intention of the adhesive that later became the key component in Post-it Notes?

Product design innovations often come from unexpected places. The story behind some of our most ubiquitous products reveals fascinating insights about the process of invention and discovery. This trivia question focuses on a common office product with an unconventional origin story that demonstrates how 'failed' experiments can lead to revolutionary products.

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A super-strong permanent adhesive for aerospace applications
A temporary bookmark adhesive for hymnals and bibles
A medical adhesive for non-irritating bandages
A repositionable adhesive specifically designed for office notes