[crankylinuxuser]

Yep, I've seen these videos before and am aghast at how nonchalantly they work with nasty stuff.

Me - I use PPE when working with pretty much any solvent or etchant. And that includes gloves and goggles at a minimum. And if the stuff is not nice, I'm using a stick of sorts to apply (wood, metal, glass; whichever's less reactive).

And if I were dealing with things like HF, you can bet your ass that I'm building some sort of automated setup. HF spattering on a webcam lens means a loss of $50. HF spattering on me means I possibly will die or suffer horrendously. Same with lasers as well. Telepresence is so much safer, and failure means a few hundred dollars of equipment replacement.