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Ahhh, I miss read the instructions then:

3. With a moistened thumb pad, draw your thumb very gingerly across, not along, the edge repeating all along its length to feel how it grips or bites into...

I also have had no success with the TPT. I tried it on everything including a brand new DE blade, and all I feel is a smooth edge even with some pressure and wet... Perhaps I am too thick skinned??

Arm hair?
TPT?
Microscope?