Okay, my friend and I have just converted over to Star San, but once we got it home, we were terrified by the bottle warnings. Is Star San safe to touch with a naked (e.g. ungloved) hand when in its properly diluted form?
Well, I've sprayed it on my hands before I crushed some fruit for wine and I'm still here to tell about it. I've even accidently drank some (long story). So, aside from some dry skin for a little while, I'm fine!
I would try not to touch it in the concentrated form. Once mixed it should be OK. If you have cuts on you hands it will burn and I have noticed that after handling it for a while my hands do start to get irritated.
I practically bathe in the stuff during a session. It splashes everywhere and I purposefully wet my hands with it while handling items that will need sanitized. The only time I've ever had a problem was when I spilled a few drops of the undiluted starsan on my hand and didn't wipe it off. After like 10 mins, it got red and a little itchy. I survived
I am pretty sure its safe. Basicbrewing.com/radio had a while ago about star san. I also remember the creator of the product saying it is safe to drink in the diluted form, i never put that to the test though.