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Thanks for that - I wasn't sure what was meant either. :)

Have you tried slurry? Either from a slurry stone or a fine dmt? I have a C12k too and find that starting with slurry speeds things up...

I'm a little confused as to the issue of surface tension with water?

I actually find the changes in water's behavior - i.e. how its interaction with the edge changes - to be a very useful guide...