Re: sharpening stone
kruizen
As a general rule 4000 grit and under require soaking for a margin of time, basically because the grit size will allow for water absorption allowing for a slurry to form when using.
No need to soak the 8000 grit stone because the grit size is so small that it basically will not absorb water. So when you mist the 8000 grit you will need to immediately apply the cutting edge that you are looking to polish to work up the slurry. Because the water stones are so "soft" it will not take long.
Note: you will not be removing much steel, you are basically taking out the lines from the lower grit stones. The 8000 grit is only for polishing the edge.
When I used water stones I only used the 8000 grit on carving tools.
Lee Valley's website would a good place to get more information.