PTFE is used in...
- your computer mouse to make it slide
- in goretex to make your clothing repel water
- In your cookware for non-stick surfaces
- In footware and medical devices to prevent blisters (ie it's rubbed against your flesh)
- On the roof of the metrodome
That being said, yeah, I don't think any spray coating is worth the mess or health risks. We don't even use a microwave in our house or teflon cookware for those reasons.
This does raise another question.
When I hit fresh balls with loads of topspin I leave pretty significant contrails of green fuzz. I've often wondered if those particals are a threat.
Anyway, I won't be proceeding with this. Doesn't make sense.
However, given the amount of PTFE we're talking about compared to the other hazards we face on a daily basis (eg emissions from coal plants) I truly doubt there's a health risk anywhere close to these other threats.
Heck, wine contains a known poison (alcohol) which many of us enjoy!