Which scientific product was originally marketed as a failure-prone lab curiosity until its manufacturer rebranded it as 'a thousand uses in search of a market', leading to its widespread adoption?

In the competitive world of scientific product development, marketing innovations can be just as important as the scientific breakthroughs themselves. Some marketing strategies have revolutionized how scientific products reach their audience and gain adoption. This poll tests your knowledge about a famous marketing pivot that transformed a scientific product's market presence.

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Post-it Notes (originally a failed adhesive that was too weak)
Teflon (originally a slippery byproduct of refrigerant research)
Scotchgard (originally an accidental spill on a lab assistant's shoe)
WD-40 (originally developed for aerospace rust prevention)