Another Kroil user here.
Never failed yet.
Stuck aluminum stem in steel fork. Galvanic corrosion, yes. Sweat, years of neglect, raw aluminum against bare steel. Kroil, sit overnight, shock from hammer blows, kroil, twist and viola.
Never thought that one would be salvageable but it was.
Not cheap, but amazing stuff. One can lasts a very long time.
Of course your results might vary.
Good luck.