Hey, I used to have a can like that.
Not a problem to share anything you can share, sir. As a chemical engineer you are likely to be aware of things I don't know or long ago forgot or know but don't tend to think of.
I'm telling you that one edge off the PTFE stone was incredibly good, but that doesn't mean it's good for the stone.
I'll buy some grain alcohol even though I don't drink alcohol. Back when I did we college students used to drink the grain hospitals had. It came in five gallon cans I believe and was the best grain alcohol ever according to what I've heard. I suspect my fraternity brothers who were medical students or something and worked in the university's hospitalmight have stolenprobably paid the hospital for the stuff. The right amount mixed in a plastic garbage can with a few gallons of fruit juice and many many cans of fruit and things of that sort made a killer drink called Yucca Flats.
I tried it once. That was too many times. Way too many times as I recall vaguely.
Happy shaves,
Jim
If the PTFE 3 in 1 gives you the best edge, and you’re sure a non PTFE 3 in 1 or other plain oil of similar viscosity doesn’t seem to give the same result, then maybe the PTFE is helping suspend the blade just right above the stones surface. Either way, if it works roll with it and if I made you paranoid with my first post clean your stone with the alcohol every few honing sessions. There’s really not too much you can do to an Arkansas stone that can’t be undone later with enough elbow grease and other chemicals. Simple green or dawn and scrubbing with any soft bristle brush can usually clean an arkansas stone well enough to switch honing fluids without any real contamination if you dry it out afterwards. Worst case the PTFE does build up over time and you have to get some SiC sandpaper and glass and lap off a few thousandths of an inch and start over. That might not happen at all or it might happen years from now.
Plenty of people out there use or try different things on the same stone, sort of like using different nagura on a JNAT. My beat up old Mystery Arkansas stone makes the best finished edges on mineral oil/alcohol about 70/30, but it’s a thick combo and I’d have to grab something thinner if I wanted to actually remove metal. Most oils and alcohols mix well enough that I never clean my old stone off. I’m constantly lapping my soft ark and carborundum to keep them cutting the way I like. All that’s happened is the 3/4” soft ark from the early 90s is now a 5/8+” ark.