Docbill, I found it interesting how you said that a good penetrating oil will climb a rusty nail. That reminded me that the now unavailable Cabot's Tasgon I mentioned as being so fantastic would climb out of an unsealed can and stain the sides and bottom.
I have used the Zep 45 that Stan mentioned, and found it far superior to Kroil, but I still keep searching for something better. I'm glad so many people have had success with Kroil, but if it ever fails you, I would try something else before resorting to more extreme measures like drilling out the stuck fastener. Patience really is a virtue when you are dealing with a stuck screw. I've had a few that resisted repeated efforts for days, and then when I went back at it weeks later it would come out as if it was never stuck. I really don't think topics like this are off topic because many of us are into repairing and restoring old doubles, and if we can help each other from stripping, breaking, or buggering screws, that's a good thing.
