> Funnily the only use I knew is not in the list. Making ceramics 
> waterproof if you don't fire it high enough to be non-porous. E.g. if 
> you fire it Raku style.

I'm guessing that's similar to the concrete and masonry treatment they 
talk about. If it makes concrete less porous, chances are it'll work for 
other things as well...

(I wonder if it works for wood?)

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