What critical product development challenge did 3M face before successfully launching Post-it Notes?

One of the most iconic office supplies we take for granted today had a fascinating development journey. Post-it Notes represent one of the most famous examples of accidental product innovation and persistent product development. Test your knowledge about how this ubiquitous sticky paper came to be, and discover the challenges and breakthroughs that turned a failed adhesive experiment into an office essential that revolutionized how we communicate and organize information.

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Finding a way to make the adhesive permanently stick to paper
Developing a cost-effective manufacturing process for the special adhesive
Getting FDA approval for the chemical compounds in the adhesive
Creating paper thin enough to be stackable but strong enough not to tear