So basically which type stones can be permanently soaked and which can't?
clay bound stones, ceramic stones, sintered stones, etc. can be soaked for the most part
resin bonded or magnesia bonded stones should not be soaked for the most part (though some benefit from a few minutes in water prior to sharpening)
there are also other stones which need to be soaked before use, but should not be left in water long term... i.e. choceras, the blue synthetic aoto, some naturals, etc. These should be dried in a cool, well ventilated area, away from direct sunlight
then, there are some stones that are just beastly and can take pretty much anything you throw at them, except maybe a hammer
